A Montbly Journal Embracing all Departments of Botanical Science Fited by JOHN M. COULTER and CHARLES R. BARNES, with the assistance of other members of the botanical staff of the University of Chicago. Fol. XL, No. 2 Issued August 16, 1905 CONTENTS FOROGENESIS IN PALLAVICINIA. CONTRIBUTIONS FROM THE HULL BOTANICAL LAB- IN PROTEOLYTIC ENZYMES. II. Arthur L. Dean 97 121 IV. Two COAST RHIZOBIA OF VANCOUVER ISLAND, B. C. (WITH three figures). Albert Schneider 135 BRIEFER ARTICLES. THE VITALITY OF SEEDS. W. J. Beal. SOME MEXICAN SPECIES OF CRACCA, PAROSELA, AND MEIBOMIA. J. N. Rose and Jos. A NEW KRYNITZKIA. J. M. Greenman 140 143 146 148 149 Communications for the Editors should be addressed to them at the University of Chicago, Chicago, Ill. Contributors are requested to write scientific and proper names with particular care and in citations to follow the form shown in the pages of the BOTANICAL GAZETTE. Separates, if desired, must be ordered in advance of publication. 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It aims, therefore, to meet the requirements, not only of the student who has the assistance of an instructor in a fully equipped laboratory, but also of the student who must work by himself and with limited apparatus. Freehand sectioning, the paraffin method, the celloidin method, and the glycerin method are treated in considerable detail. In later chapters specific directions are given for making such preparations as are needed by those who wish to study the plant king. dom from the algae up to the flowering plants. Special attention is paid to the staining of karyokinetic figures, because the student who masters this problem will find little difficulty in differentiating other structures. Formulas are given for the reagents commonly used in the histological laboratory. $1.50, net; $1.59 postpaid THE UNIVERSITY OF CHICAGO CHICAGO and 156 Fifth Physical Chemistry in the Service of the Sciences ce By JACOBUS H. VAN 'T HOFF, Professor at the University of Berlin In Four Groups PHYSICAL CHEMISTRY as related to 1. Pure Chemistry 2. Industrial Chemistry 3. Physiology 4. Geology Typical Reviews The eight lectures presented in this volume have already appeared in German and been noted in this Journal, 24. 1217 (1902). The volume before us is an unusually elegant one, which makes a strong appeal to the booklover as well as the chemist. From the fact, probably, that the lectures were originally given in English, this version reads more smoothly than does the German, and the former possesses a charm which one does not find in the latter.- Journal of the American Chemical Society. This is an extremely readable book, interest being sustained from first to last. The chapters on "Physical Chemistry and Physiology" are particularly interesting, taking up the theories of solution, osmotic pres. sures, and the specific action of chemical ions in the physical metabolism, the second chapter taking up the subject of enzymes and their effect as catalytic agents tending toward chemical equilibrium. In the chapters on Geology, something of the chemistry of space is discussed, the formation and structure of geological salts, and the influence of heat and variations in temperature upon crystallization. The book will commend itself particularly to teachers and advanced students.-The Technical World. The University of Chicago Press Of Interest to Instructors in Analytical Instructors in CHICAGO Physicians Geologists 156 Fifth Avenue NEW YORK |