Botanical Gazette, Band 24John Merle Coulter, M.S. Coulter, Charles Reid Barnes, Joseph Charles Arthur University of Chicago Press, 1897 Publishes research in all areas of the plant sciences. |
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Häufige Begriffe und Wortgruppen
acuminate alar region algæ Amblystegium antherozoid apex appear archegonium average base botanic garden BOTANICAL GAZETTE botanists branches bud scales capsule carpels Celastrales cent central strand centrosome Chicago cortex costa Cuernavaca cyanhydric acid described diameter dicotyledons Disco diseased elliptical elongation embryo epidermal Flora flowers fungi Gametophyte genus Godhavn ground tissue growth Herb Holw hyaline Hypnum hypodermal increase island lanceolate lateral layers of cells leaf cells leaves length Longitudinal membrane middle monocotyledons Moss Musc normal nucleus oblong ovate papillose parenchyma pedicel peristome plants Plate pollen pollen tube present pseudoparenchyma Puccinia pyrenoids receptaculum resin canals riparium roots rows of cells Schimper seeds shoots showing side slender species specimens spores Sporophyte stamens stems stipe stomata strobilus structure Sub-order Sullivant teleutosori thick thickened tion transversely trees tube tumor turgor Turnavik University usually varying vegetative volva wall wide width Zamia
Beliebte Passagen
Seite 363 - GOD ALMIGHTY first planted a garden. And, indeed, it is the purest of human pleasures ; it is the greatest refreshment to the spirits of man, without which buildings and palaces are but gross handiworks.
Seite 118 - THE FERTILITY OF THE LAND: A summary Sketch of the Relationship of Farm-Practice to the Maintaining and Increasing of the Productivity of the Soil. By IP ROBERTS, Director of the College of Agriculture, Cornell University.
Seite 364 - ... existing in Jamaica, Trinidad, and Demerara is so evident that lately botanic gardens have been started in Antigua, Dominica, Montserrat, and St. Kltts Nevis, among the Leeward Islands ; In Grenada, St. Lucia, and St. Vincent,1 among the Windward Islands ; and still more recently in British Honduras. Botanic gardens In the Tropics do the work, on the plant side, of agricultural departments in temperate climates. They are in themselves experimental stations and are much more efficient in introducing...
Seite 19 - IO per cent, solution proved thoroughly satisfactory. By the use of this solution I was able to keep the antherozoids living and moving for a considerable time, usually from thirty to sixty minutes, and in one case two hours and forty-four minutes When mature pollen tubes are placed in sugar solution the proximal cell, protoplasm, etc., can at first be seen to have their normal shape, the antherozoid cells usually still adhering to each other {fig. 5 A). In a few minutes, however, when the sugar...
Seite 142 - Department of Agriculture ; Dr. CF Millspaugh, Curator of the Botanical Department of the Field Columbian Museum, Chicago; Dr. Charles Mohr, State Botanist of Alabama; Dr. WP Wilson, Director of the Philadelphia Commercial Museums; and Prof. HH Rusby, of the New York College of Pharmacy. This Sub-Commission solicits information concerning the medicinal plants of the United States from every one in a position to accord it. The principal points of study are as follows : 1.
Seite 233 - Equisçtinese (8 and 9), which is doubtless identical with the similar organ in Zamia and Ginkgo. They apparently originate in the spermatids, since no trace of them could be discovered in the spermatid mother-cells in the resting condition or during karyokinesis. The first changes visible in the metamorphosis of the spermatid cells occur in these organs. They gradually become extended into a thread which assumes the form of a helicoid spiral of which the extended turns of the posterior end surround...
Seite 20 - ... amoeboid motion even if they are not ciliated. The writer is not aware that attention has before been called to this mode of motion in sperm cells. The vibration of the cilia in vigorous spermatozoids is exceedingly rapid and difficult to study. Judging from observation made on certain spermatozoids just starting motion and others which had nearly exhausted their energy, there would seem to be a rhythmic contraction of the cilia which passes quickly from one end of the band to the other. A tremulous...
Seite 228 - ... has been studied, they are so small that thus far the fate of the cilia and cytoplasm, which are not generally supposed to be concerned in fecundation, has not been determined with certainty.