bodies, and radiating from one to the other in a quite orderly manner. What is it now? Perhaps the vibration of a subtle ether interfused through all bodies; perhaps the vibration of the atomic parts themselves of those bodies. Who will venture to say? Attraction and affinity are no longer the clearly defined ultimate facts they seem to be; we know so much at least, that they are intimately connected with electrical phenomena, though not to what extent. That electricity is implicated with chemical composition, and recomposition, is clearly recognised; and Sir J. Her schel has lately expressed his opinion, that it is impossible any longer to attempt the explanation of the movements of all the heavenly bodies by simple attraction, as understood in the Newtonian theory-these comets, with their trains perversely turned from the sun, deranging sadly our systematic views. The ray of light, which, with its reflection and its refraction, seemed a quite manageable substance, has deserted us, and we have an ethereal fluid-the same as that which constitutes heat, or another -substituted in its stead. Science has no language, and knows not how to speak. If she lectures one day upon the "polarisation" of light, she professes the next not to know what she means by the term; she is driven even to talk of "invisible rays" of light, or chemical rays. Never was it so difficult to form any scientific conception on these subjects, or to speak of them with any consistency. Mrs. Somerville is a correct writer; yet she opens her brief section upon magnetism thus:-" Magnetism is one of those unseen imponderable exist ences, which, like electricity and heat, are known only by their effects. It is certainly identical with electricity, for," &c. It is like, and it is identical, in almost the same sentence. Even in the fields of astronomy, where we have to deal with large masses of matter, it is no longer possible for the imagination to form any embraceable system. We are plunged into hopeless infinitude, and the little regularities we had painfully delineated on the heavens are all effaced. The earth had been torn from its moorings and sent revolving through space, but it revolved round a central stationary sun. Here, at least, was something stable. The sun was a fixed centre for our minds, as well as for the planetary system. But the sun himself has been uprooted, and revolves round some other centre-we know not what or else travels on through infinite space-we know not whither. A little time ago, the stately seven rolled round their central orb in clear anduninterrupted space; their number has been constantly increasing; we reckon now seventeen planetary bodies that can be reduced to no law of proportion or harmony, either as to their size, their orbits, the inclination of their axes, or any other planetary property; and the space they circulate in is intruded on by other smaller "Nor are there," writes Humboldt, " any constant relations between the distances of the planets from the central body round which they revolve, and their absolute magnitudes, densities, times of rotation, eccentricities and inclinations of orbit and of axis. We find Mars, though more distant from the sun than either the earth or Venus, inferior to them in magnitude; Saturn is less than Jupiter, and yet much larger than Uranus. The zone of the telescopic planets, which are so inconsiderable in point of volume, viewed in the series of distances commencing from the sun, comes next before Jupiter, the greatest in size of all the planetary bodies. Remarkable as is the small density of all the colossal planets which are farthest from the sun, yet neither in this respect can we recognise any regular succession. Uranus appears to be denser than Saturn, and (though the inner group of planets differ but little from each other in this particular) we find both Venus and Mars less dense than the earth, which is situated between them. The time of rotation increases, on the whole, with increasing solar distance, but yet it is greater in Mars than in the earth, and in Saturn than in Jupiter." After other remarks of the same character, he adds, " The planetary system, in its relation of absolute magnitude, relative position of the axis, density, time of rotation, and different degrees of eccentricity of the orbits, has, to our apprehension, nothing more of natural necessity than the relative distribution of land and water on the surface of our globe, the configuration of continents, or the elevation of mountain chains. No general law, in these respects, is discoverable either in the regions of space or in the irregularities of the crust of the earth.” and miscellaneous bodies, asteroids, and the like, some of which, it seems, occasionally fall to the earth. Comets come sweeping in from illimitable space, requiring, it is thought, some eight thousand years for their revolution round the sun. Some of these cross each other's orbits: one has crossed the orbit of the earth; and their decreasing circle round the sun, gives notice of some unknown ether suffused through the interstellar spaces. The outlying prospect, beyond our system, grows still more bewildering. The stars are no longer "fixed," nor is their brilliancy secured to them; this increases and diminishes with perplexing mystery. What seemed a single point of light, resolves itself into two stars revolving round each, perhaps reciprocally sun and planet. The faint and telescopic nebula, just reached by the glass in one age, is found in the next to be a congrega. tion of innumerable stars. Our milky way is, at the same distance, just such another nebula. "The elder Herschel calculates that the light of the most distant nebula discovered by his forty-feet refractor, requires two millions of years to reach our eyes." Oh, shut up the telescope! the reason reels. Science, in short, presents before us a field of perpetual activity-of endless excitement, and that of the highest order of practical results of the greatest utility and most beneficial description; but it gives no prospect of any resting-place-any repose for the speculative reason-any position with which the scientific mind shall be content, and from which it shall embrace the scene before it in its unity and harmony. Always will it be Moving about in worlds half-realized." Having touched upon these subtle agencies of light, and heat, and electricity, and on the increasing difficulty we have of framing to ourselves any distinct conception of them, we cannot refrain from alluding to a little work or pamphlet, by Mr. Grove, entitled, The Correlation of Physical Forces, in which this subject is treated with great originality. Mr. Grove has made himself a name in experimental science by his discoveries in electricity and chemistry; in this pamphlet he shows, that he has the taste and power for enlarged specula tion on the truths which experiment brings to light. We would recom mend the perusal of his pamphlet to all who are interested in these higher and more abstract speculations. How far the wide generalisation he adopts is sustained by facts, we are not prepared to say. But it is a powerful work, and it is a singular one; for it is not often, in this country at least, that a man so well versed in the minutiae of science ventures upon so bold a style of generalisation. After reviewing some of the more lately discovered properties of electricity, heat, light, and magnetism, and showing how each of them is capable of producing or resolving itself into the others, he reasons that all the four are but the varied activity of one and the same element. He adds, that this element is probably no other than the primitive action itself; and that, in fact, these may be all regarded as affections of matter, which follow in their legal sequence, and not as the results of separate fluids or ethers. We are not sure that we do justice to his views, as we have not the work at hand, and it is some time since we read it; but we are persuaded that its perusal will be of interest to a philosophic reader, though its reasoning should fail to satisfy him. But we have not placed the title of Mrs. Somerville's book at the head of this paper, as an occasion to involve ourselves in these dark and abstract discussions. We are for out-of-door life; we would survey this visible round world, whose various regions, with their products and their inhabitants, she has brought before us. Physical geography," thus commences our writer, "is a description of the earth, the sea, and the air, with their inhabitants animal and vegetable, of the disthe causes of that distribution. Political tribution of these organized beings, and and arbitrary divisions are disregarded: with respect to these great features, that the sea and the land are considered only have been stamped upon them by the hand of the Almighty; and man himself is viewed but as a fellow-inhabitant of the globe with other created things, yet influencing them to a certain extent by his actions, and influenced in return." Physical geography stands thus in 66 contrast_with_political and historical geography. Russia is here no despotism, and America no democracy; they are only portions of the globe inhabited by certain races. To some persons it will doubtless seem a strange geography" that takes no notice of the city, and respects not at all the boundaries of states. Those to whom the name recalls only the early labours of the school-room, when counties and county-towns formed a great branch of learning-where the blue and red lines upon the map were so anxiously traced, and where, doubtless, some suspicion arose that the earth itself was marked out by corresponding lines, or something equivalent to them -will hardly admit that to be geography which takes no note of these essential demarcations, or allow that to be a map in which the very city they live in cannot be found. To them the Physical Atlas will still seem nothing but a series of maps, in which most of the names have still to be inserted. They unconsciously regard cities and provinces as the primary objects and natural divisions of the earth. They share something of the feeling of that good man, more pious than reflective, who noted it as an especial providence that all the great rivers ran by the great towns. Others, however, will be glad to escape for a time from these landmarks which man has put upon the earth, and to regard it in its great natural lineaments of continent and sea, mountain and island. To do this with advantage, it is necessary to disembarrass ourselves, both in the book and the map, of much that in our usual nomenclature ranks pre-eminently as geography. Nor is it easy to study this, more than the older branch of geography, without an appropriate atlas. To turn over the maps of Mr. Johnston's, and con the varied information which accompanies them, is itself a study, and no disagreeable one. Of the extent of this information we can give no idea by extract or quotation; it is manifestly in too condensed a form for quotation; it is a perfect storehouse of knowledge, gathered from the best authorities. The first thing which strikes an observant person, on looking over a map, or turning round a globe, is the unequal division and distribution of land and water. Over little more than one-fourth of the surface of the earth does dry land appear; the remaining three-fourths are overflowed by water. And this land is by no means equally disposed over the globe. Far the greater part of it lies in the northern hemisphere. "In the northern hemisphere it is three times greater than the south." Of the form which this land assumes, the following peculiarities have been noticed : "The tendency of the land to assume a peninsular form is very remarkable, and it is still more so that almost all the peninsulas tend to the south-circumstances that depend on some unknown cause which seems to have acted very extensively. The continents of South America, Africa, and Greenland, are peninsulas on a gigantic scale,all tending to the south; the Asiatic peninsula of India, the Indo Chinese peninsula, those of Corea,Kamtchatka, of Florida, California, and Aliaska, in North America, as well as the European peninsulas of Norway and Sweden, Spain and Portugal, Italy and Greece, take the same direction. All the latter have a rounded form except Italy, whereas most of the others terminate sharply, especially the continents of South America and Africa, India and Greenland, which have the pointed form of wedges; while some are long and narrow, as California, Aliaska, and Malacca. Many of the peninsulas have an island,or group of islands, at their extremity as South America, which terminates with the group of Terra del Fuego; India has Ceylon; Malacca has Sumatra and Banca; the southern extremity of New Holland ends in Van Diemen's Land; a chain of islands run from the land has a group of islands at its extreend of the peninsula of Aliaska; Greenmity; and Sicily lies close to the termination of Italy. It has been observed, as another peculiarity in the structure of peninsulas, that they generally terminate boldly, in bluffs, promontories, or mountains, which are often the last porSouth tions of the continental chains. America terminates in Cape Horn, a high promontory which is the visible termination of the Andes; Africa with the Cape of Good Hope; India with Cape Comorin, the last of the Ghauts; New Holland ends with South-East Cape in Van Diemen's Land; and Greenland's farthest point is the elevated bluff of Cape Farewell." These are peculiarities interesting of a ruin as evidence of some disastrous to notice, and which may hereafter catastrophe; and Burnett, in his explain, or be explained by, other Theory of the Earth, conceived the ideal phenomena. Resemblances and ana- or normal state of our planet to be that logies of this kind, whilst they are of a smooth ball, smooth as an egg. permitted only to direct and stimulate The notion not only betrays the low inquiry, have their legitimate place in state of scientific knowledge in his age, science. It was a resemblance of this but a miserable taste in world-architecdescription, between the zig-zag course ture, which, we may remark in excuse of the metalliferous veins, and the path for poor Burnett, was, almost as much of the lightning, which first suggested as his scientific ignorance, to be shared the theory, based, of course, on very with the age in which he lived. For different reasonings, that electricity it is surprising, with the exception of had essentially contributed to the for- a few poets, how destitute men mation of those veins-a theory which were, in his time, of all sympathy Mrs. Somerville has considered suf- with, and admiration of, the grander ficiently sound to introduce into her and more sublime objects of nature. work. "We have changed all that!" The mountain range, pouring down its streams into the valleys on both sides, is not only recognised as necessary to the fertility of the plain; but, strange to say, we become more and more awake to its surprising beauty and magnificence. The description of the mountain ranges of the several continents of the world, forms one of the principal attractions of the study of physical geography, and one of the great charms of Mrs. Somerville's book. What lies within our globe is still matter of conjecture. The radius of the earth is 4000 miles, and by one means or another, mining, and the examination of the upheaved strata, and of what volcanoes have thrown out, we are supposed to have penetrated, with speculative vision, to about the depth of ten miles. "The increase of temperature," writes Mrs. Somerville," with the depth below the surface of the earth, and the tremendous desolation hurled over wide regions by numerous fire-breathing mountains, show that man is removed but a few miles from immense lakes or seas of liquid fire. The very shell on which he stands is unstable under his feet, not only from those temporary convulsions that seem to shake the globe to its centre, but from a slow, almost imperceptible, elevation in some places, and an equally gentle subsidence in others, as if the internal molten matter were subject to secular tides, now heaving and now ebbing; or that the subjacent rocks were in one place expanded and in another contracted by changes in temperature." Perhaps these "immense lakes or seas of liquid fire" are a little too hastily set down here in our geography. But of these obscure regions beneath the earth, the student must understand he can share only in the best conjectures of scientific men. Geology is compelled, at present, in many cases, to content herself with intelligent conjecture. To return again to the surface of the earth, the first grand spectacle that strikes us is the mountains. Before it was understood how the mountain was the parent of the river, the noble elevation was apt to be regarded in the light The mountains of Asia take precedence of all others in altitude and length of range. "The mean height of the Himalaya is stupendous. Captain Gerard and his brother estimated that it could not be less than from 16,000 to 20,000 feet; but, from the average elevation of the passes over these mountains, Baron Humboldt thinks it must be under 15,700 feet. Colonel Sabine estimates it to be only 11,510 feet, though the peaks exceeding that elevation are not to be numbered, especially at the sources of the Sutlej. Indeed, from that river to the Kalee, the chain exhibits an endless succession of the loftiest mountains on earth; forty of them surpass the height of Chimborazo, one of the highest of the Andes, and several reach the height of 25,000 feet at least. The valleys are crevices so deep and narrow, and the mountains that hang over them in menacing cliffs are so lofty, that these abysses are shrouded in perpetual gloom, except where the rays of a vertical sun penetrate their depths. From the steep ness of the descent the rivers shoot down with the swiftness of an arrow, filling the caverns with foam and the air with mist. are but little lower than the top of Mont Blanc; many are higher, especially near the Sutlej, where they are from 18,000 to 19,000 feet high; and that north-east of Khoonawur is 20,000 feet above the level of the sea, the highest that has been attempted. All are terrific, and the fatigue and suffering from the rarity of the air in the last 500 feet is not to be described. Animals are as much distressed as human beings, and many of them die; thousands of birds perish from the violence of the winds; the drifting snow is often fatal to travellers, and violent thunder-storms add to the horror of the journey. The Niti Pass, by which Mr. Moorcroft ascended to the sacred lake of Manasa, in Tibet, is tremendous: he and his guide had not only to walk bare-footed, from the risk of slipping, but they were obliged to creep along the most frightful chasms, holding by twigs and tufts of grass, and sometimes they crossed deep and awful crevices on a branch of a tree, or on loose stones thrown across. Yet these are the thoroughfares for commerce in the Himalaya, never repaired, nor susceptible of improvement, from frequent landslips and torrents. The loftiest peaks, being bare of snow, give great variety of colour and beauty to the scenery, which in these passes is at all times magnificent. During the day, the stupendous size of the mountains, their interminable extent, the variety and sharpness of their forms, and, above all, the tender clearness of their distant outline melting into the pale blue sky, contrasted with the deep azure above, is described as a scene of wild and wonderful beauty. At midnight, when myriads of stars sparkle in the black sky, and the pure blue of the mountains looks deeper still below the pale white gleam of the earth and snowlight, the effect is of unparalleled sublimity; and no language can describe the splendour of the sunbeams at daybreak streaming between the high peaks, and throwing their gigantic shadows on the mountains below. There, far above the habitation of man, no living thing exists, no sound is heard; the very echo of the traveller's footsteps startles him in the awful solitude and silence that reign in these august dwellings of everlasting snow." The table-lands of Asia are on a scale corresponding with its mountains. But the same elevation, it is remarked, is not accompanied with the same sterility in these parts of the world, as in the temperate zone. Corn has been found growing at heights exceeding the summit of Mont Blanc. According to Mr. Moorcroft, the sacred lake of Manasa, in Great Tibet, and the surrounding country, is 17,000 feet above the sea, which is 1240 feet higher than Mont Blanc. In this elevated region wheat and barley grow, and many of the fruits of Southern Europe ripen. The city of H'Lassa, in eastern Tibet, the residence of the Grand Lama, is surrounded by vineyards, and is called by the Chinese the Realm of Pleasure!" Nevertheless the general aspect of the tablelands is that of a terrific sterility. Here is a striking description of them. We should have been tempted to say, that in this singularly dark appearance of the sky at mid-day, there was something of exaggeration, if our own limited experience had not taught us to be very cautious in attributing exaggeration where the scenic effects of nature are concerned. "In summer the sun is powerful at mid-day; the air is of the purest transparency, and the azure of the sky so deep that it seems black as in the darkest night. The rising moon does not enlighten the atmosphere; no warning radiance announces her approach, till her limb touches the horizon, and the stars shine with the distinctness and brilliancy of suns. In southern Tibet the ver dure is confined to favoured spots; the The description of the territory of the East India Company will be read with interest. We cannot afford space to extract it. Plains and valleys the very richest in the globe are to be found here, as also much rank marshy land, and also much jungle. "It has been estimated that a third of the East India Company's territory is jungle." As a set-off against this jungle we have it intimated that, if proper search were made, gold would probably be found in this territory, as abundantly as in California. We sincerely hope |
