VOL. IV. THE CELL IN DEVELOPMENT AND 

 INHERITANCE. 



By EDMUND B. WILSON, Ph.D., LL.D., 



Professor of Zoology, Columbia University. 



371 pages. 142 Illustrations. Price, $3.50 net. 



" In the highest degree fascinating. ... It is a 

 matter for congratulation that Professor Wilson has 

 given us in our own speech a book which is second 

 to none in the clear and comprehensive manner in 

 which the facts of cell-structure and division are set 

 forth, and the masterly way in which the principal 

 theories are stated and criticised." Nature. 



" It certainly takes rank at once among the most 

 important biological works of the period." 



Science. 



"We heartily recommend this book. There are 

 many practitioners who have neither time nor disposi- 



tion to read the larger treatises on botany or histology 

 in which the modern views on the structure and func- 

 tions of the cell are to be found in detail. ... In, 

 the present volume they will find an admirable expo- 

 sition of the knowledge that has been acquired during 

 the last, twenty years." London Lancet. 



" One of the very best scientific manuals published 

 in America. ... A noteworthy characteristic of the 

 book is its thoroughness. . . . Students and inves- 

 tigators of biology, in whatever department they may 

 be working, ought to be familiar with this important 

 work." New York Nation. 



VOL. V. THE FOUNDATIONS OF ZOOLOGY. 



By WILLIAM KEITH BROOKS, 



Professor of Zoology, Johns Hopkins University. 



8vo. Cloth, viii + 339 pages. Price, $2.50 net. 



" A book that will live as a permanent addition to 

 the common sense of science. It belongs to literature 

 as well as to science. It belongs to philosophy as 



much as to either, for it is full of that fundamental 

 wisdom about realities which alone is worthy of the 

 name of philosophy." Science. 



VOL. VI. THE PROTOZOA. 



By GARY N. CALKINS, Ph.D., 



Instructor in Zoology, Columbia University 

 8vo. Cloth. 365 pages. Price, $3.00 net. 



The object of this volume is to set forth the main characteristics of the Protozoa without undertaking an 

 exhaustive description. It is intended for students and for general readers who wish to know what the Pro- 

 tozoa are, and what their relations are to current biological., problems. In the first few chapters of the book 

 the Protozoa are treated as a phylum of the animal kingdom. A short historical sketch leading up to the 

 present systems of classification is followed by a general description of the group, touching upon some of the 

 more special subjects, such as mode of life, motion, excretion, respiration, reproduction, colony-formation, 

 encystment, etc., and this is followed by more general subjects dealing with the Protozoa in relation to man 

 and other animals; e.g. their sanitary aspects, parasitism, symbiosis, etc. 



In the final chapter the Protozoa are dealt with from the standpoint of phylogeny. Theories as to the 

 origin of life, spontaneous generation, and the relations of the classes of Protozoa to one another are con- 

 sidered, and the volume ends with a discussion of the various views regarding the origin of the Metazoa from 

 the Protozoa. 



VOL. VH. REGENERATION. 



By THOMAS HUNT MORGAN, 



Professor of Biology, Bryn Mawr College, 

 Author of "THE DEVELOPMENT OF THE FROG'S EGG." 



VOL. VHI. AN INTRODUCTION TO COMPARA- 

 TIVE NEUROLOGY. 



By OLIVER S. STRONG, Ph.D. 

 THE MACMILLAN COMPANY, 66 Fifth Avenue, New York. 



