Page:Popular Science Monthly Volume 50.djvu/876

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point of view, of the more important developments in its field. Electro technology, which in the last decade has exerted an important action on those branches of physics which form its base, "seems at present," says the author, "to have entered on a phase of quieter development; and from the scientific point of view the time appears suitable to survey the position, critically to investigate results of very unequal value, often hastily brought to light amid the bustle of practical work, and to blend the older as well as the more recent results into one consistent exposition." He has not included much historical matter except in the seventh chapter, where he gives the history of the analogy between the magnetic circuit and various other kinds of circuits. The first five chapters of the work are devoted to Theory, and the last six to Applications. In stating the theory of the magnetic circuit, a knowledge of the results of investigations into ferro-magnetic induction is assumed. In Chapters III and IV the outlines of the theory of "rigid" magnets on the one hand and of absolutely "soft" cores on the other are summarized, the mode of treatment being similar to that of Maxwell. The topics falling within the second part of the book magnetic circuits of dynamos or electro-motors and of various kinds of electromagnets and transformers, the experimental determination of field intensity, magnetization, induction, etc. are treated more from the point of view of applied physics. Wherever the more important results of allied branches of mathematical or experimental physics are assumed to be known, the author has referred lo the original passages in accessible text-books. There are also many references to original papers in which details may be further studied.



Agricultural Experiment Stations. Bulletins, Reports, etc. New Jersey: Tuberculosis in Cattle and its Relation to Human Consumption. By Julius Nelson. Pp. 24; Fertilizer Analyses, etc. Pp. 76.—United States Department of Agriculture: Insects Injurious to Stored Grain. By P. H. Chittenden. Pp. 240; Grasses and Forage Plants of the Dakotas. By Thomas A. Williams. Pp. 47; Studies of American Grasses. By various anthers. Pp. 43; Insects affecting Domestic Animals. By Herbert Osborn. Pp. 362.

American Forestry Association. Proceedings. Vol. XI. Pp. 65-123.

Chicago Academy of Sciences. Thirty-ninth Annual Report. 1890. Pp. 60.

Crosby, W. E. Our Little Book for Little Folks. American Book Company. Pp. 106. 30 cents.

Davenport, Charles Benedict. Experimental Morphology. Part VI. New York: The Macmillan Company. Pp. 28. $2.00.

Duluth News Tribune. Duluth, Minn. A Vast Empire and its Metropolis. Pp. 100, with plates and maps.

Euroclydon, The. A Journal of Economic, Social, and Moral Science. J. T. McColgan. Editor. Monthly. Nashville, Tenn. Pp. 22. 10 cents; $1 a year.

Expositor. The. A Theological Magazine. Vol. I, No. 1. February, 1897. American edition. New York: Dodd, Mead & Co. Pp. 104. 25 cents; $3 a year.

Felts, Walter W. Natural Law in the Business World. New York: The Author, 112 Fifth Avenue. Pp. 128. 25 cents.

Jordan, David Starr, and others. Observations on the Fur Seals of the Pribylof Islands. Washington: Government Printing Office. Pp. 69, with maps.

Kealing, H. T., Editor. The African Methodist Episcopal Church (Quarterly Review. Pp. 56. 35 cents; $1.25 a year.

Mach, Ernst. Contributions to the Analysis of the Sensations. Translated by C. M. Williams. Chicago: Open Court Publishing Company. Pp. 208. $1.

Mason, R Osgood. Telepathy and the Subliminal Self (Hypnotism, Automatism, Dreams, Phantoms). New York: Henry Holt & Co. Pp. 343.

Massachusetts Institute of Technology, Boston. Annual Catalogue, 1896-'97. Pp. 307.

Matas, Rudolph, M. D., Tulane University, Louisiana. The Surgical Peculiarities of the American Negro. Pp. 130. Fracture of the Zygomatic Arch. Pp. 19.

Mercer, Henry C. Researches upon the Antiquity of Man in the Delaware Valley and the Eastern United States. Boston: Ginn & Co. Pp. 178.

New York Academy of Sciences: Transactions. Vol. XV. 1895-'96. Pp. 366, with plates.—Third Annual Reception, March 26, 1896. Catalogue of Exhibits. Pp. 48.

Normal, The Philomath. Vol. I. No 1. January, 1897. Edmond, Oklahoma, Normal School. Monthly. Pp. 28. 25 cents a year.

Open Court Publishing Company, Chicago. Important Biological Publications. Pp. 12.

Philosophical Society of Washington. Bulletin, Vol. XII, 1892-1894. Pp. 567, with plates.

Polyglott, The. A Pocket Review for Students and Amateurs of Modern Languages. Philadelphia: Fernand & Britton Company, Betz Building.

Reprints. Baldwin, J. Mark: Princeton Contributions to Psychology. Pp. 40.—Bangs, L. Bolton, M. U.: The Treatment of Syphilis. Pp. 14.—Burton, George H.: Evidence of the Former Extension of Glacial Action on the West Coast of Greenland and in Labrador and Baffin Land. Pp. 6.—Bessey, Prof. C. E.: The Metric System in Botany. Pp. 2.—Boas, Franz: Traditions of the Ts'ets' ánt. Pp 12. The Limitations of the Comparative Method in Anthropology. Pp. 60—Brigham, Albert Perry: Glacial Flood Deposits in Chenango Valley. Pp. 12, with plate—Dellenbaugh, F. S.: Death Masks in Ancient American Pottery. Pp. 6.—Ingraham, Charles Wilson, M. D.: Successful Treatment of Pulmonary Tuberculosis. Pp. 9.; The Treatment of Pneumonia,