ii New Editions Fundamentals of Bacteriology-Morr THE FIRST EDITION won wide favor as a general text-book on ology. The original method of presentation is preserved. adhered to, so that the individual instructor may have full liber in which he is especially interested. A number of illustrations Examp text has been improved in many instances by the addition of furt and the most recent general advances in the Science. Classification of the Society of American Bacteriologists, which text, their Key to the Genera of Bacteria, a discussion of the H-io of. standarization, the selective action of anilin dyes, the med pathogenic organisms into the body, a more detailed explanatio bodies, the nature of antigens and a table of antigens and antib ΑΝ N experience of nearly twenty years in the teaching of Bact the author that students of this subject need a comprehens field and special training in fundamental technic before special Each student is line of work. This text-book covers the first or introductory requires two classroom periods per week. Results a laboratory periods of three hours per week along with the clas the laboratory work is given at the end of the text. this plan. DR. R. MORREY has visited all the important laboratories in Ge Denmark, Holland, and also Paris and London, and is pers the foremost bacteriologists of these countries. This rich experi ance guarantee the accuracy of his work. Also the author has of the literature of Bacteriology, covering the standard text-bo reference and the leading periodicals. Thus the latest inform porated. The majority of the illustrations are original. 12mo. 320 pages, with 171 engr By CHARLES B. MORREY, B.A., M.D., Professor of Bacteriology ment, Ohio State University. Chemistry of Agriculture-Stoddart MANY improvements and additions will be noticed in this n material has been added and parts have been rewritten to m At the end of each chapter is a list of suggestive exercises. Thes and drive home to him the gist of the subject matter and its conditions. Sections have been added on colloids, now a very cultural chemistry; on new fertilizer materials, showing the d potash resources as a result of the Great War, and also of syn lizers. To facilitate the teaching of the subject the order of the been changed. The chapters on the Chemistry of Animal Ph Digestion have been changed and amplified. THE opening chapters deal with the conditions requisite to see chemical constituents of plants and plant food; the availa food elements in the soil, and with the chemistry of plant chemistry are shown the chemical constituents of the various cr made by each on the supply of available plant food in the soil and chemical composition, is treated in the light of the knowled In logical sequence are taken up the correction of acid soil; the cropping under various conditions, and the maintenance and res by means of commercial fertilizers, nitrogenous crops and farm HE applications of Chemistry in animal husbandry, in the dair of insect pests and parasitic growths, particularly in the compounds, are presented in such form as to be of definite pract By CHARLES W. STODDART, Ph.D., Professor of Agricultural 12mo. 340 pages, with 84 illustrations. State College. TH Catalog gladly sent on request 706-10 Sansom St. LEA & FEBIGER New (24) subject of bacteri text-book idea is expand on topics e been added, the xplanatory matter Te the System of ed throughout the centration method m of entrance of he origin of anti gy has convinced asp of the entire n any particular ster's work, and led to take two The outline of seem to justify Austria, Russia, acquainted with A wide acquainthorough review ell as works of as been incor I of the Depart nd 6 plates. Cloth, $3.25 net. New (2d) Edition n. Much new subject clearer. le reader think in to practical t part of agrint of our own ogenous fertie chapters has and Food and tion; with the conversion of Under crop and the drain 1. its physical sly conveyed ty of soils to soil fertility e destruction of spraying › the farmer. Pennsylvania th, $2.50 net. 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