Experiment Station Record, Band 19

U.S. Government Printing Office

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Seite 384 - The deleterious effect of atmospheric weathering on the wearing qualities of rocks has been demonstrated. (4) The cementing value of rocks is, to a certain degree, measured by the abundance of secondary minerals resulting from rock decay. (5) Metamorphic rocks have, as a rule, a low binding power, owing to a regeneration of secondary minerals and to the effects of heat and pressure. The foliated types part readily along planes of schistosity, and therefore are not well adapted to road construction....
Seite 179 - There can be no doubt but that in a certain number of cases the tuberculosis occurring in the human subject, especially in children, is the direct result of the introduction into the human body of the bacillus of bovine tuberculosis ; and there also can be no doubt that in the majority at least of these cases the bacillus is introduced through cows
Seite 370 - Report of the committee on sanitary relations to a conference appointed by the Commissioners of the District of Columbia to consider and report upon the local milk supply.
Seite 666 - As in the case of boric acid, salicylic acid, and sulphurous acid, this injury manifests itself in a number of different ways, both in the production of unfavorable symptoms and in the disturbance of metabolism. These injurious effects are evident in the medical and clinical data which show grave disturbances of digestion, attended by phenomena which are clearly indicative of irritation, nausea, headache, and in a few cases vomiting. These symptoms...
Seite 102 - One need is a journal for the stations, to contain accounts of their current research, abstracts of similar work in this and in other countries, and other matters of mutual interest. What is wanted is a publication, properly edited, adapted to our special conditions, appearing regularly and giving the latest information, doing for workers in these lines what Die...
Seite 545 - The foreign commerce and navigation of the United States for the year ending June 30, 1913, p.
Seite 588 - Instruction shall give such information and assistance and establish such requirements as may seem necessary for the proper organization and maintenance of such schools, and, with the advice of the president of the Michigan State Agricultural College, determine the qualifications required of teachers employed in such schools : Provided, That no person shall be eligible to a position as superintendent of any school established under this act, who is not a graduate of a state college of agriculture....
Seite 117 - ... the ones which will be formed and will control the concentration of the soil moisture. This fact, together with the well-known phenomena of absorption, gives a satisfactory explanation of the observation that the concentration of the soil moisture is low and varies but little for different soils and with the total amount of phosphoric acid in the soils. For the same reason, the addition of phosphatic fertilizers can not be expected to influence materially the concentration of phosphoric acid...
Seite 320 - The evidence so far obtained appears to indicate that under certain conditions and with certain crops feldspar can be made useful if it is ground sufficiently fine. On the other hand, it is highly probable that under other conditions the addition of ground feldspar to the land would be a useless waste of money. At the present stage of the investigation it would be extremely unwise for anyone to attempt to use ground rock, except on an experimental scale...
Seite 463 - It is a matter of common knowledge that there are sold yearly hundreds of carloads of wheat screenings (which being interpreted means in the main weed seeds screened from wheat prior to the milling process). Sheep and poultry handle them well; but the digestive system of neither horse nor cow is able to destroy them. To employ materials carrying viable weed seed in the mixture of "dairy" or "horse" feeds, even though they are plastered over with molasses, is little short of atrocity.

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