VOL. IV. THE CELL IN DEVELOPMENT AND 

 INHERITANCE. 



By EDMUND B. WILSON, Ph.D., 



Professor of Invertebrate Zoology^ Columbia University. 



371 pages. 142 Illustrations. Price, $3.00. 



[EXTRACTS FROM PREFACE AND INTRODUCTORY CHAPTER.] 



*' This volume is the outcome of a course of lec- 

 tures, delivered at Columbia University in the winter 

 of 1892-1893, in which I endeavored to give to an 

 audience of general university students some account 

 of recent advances in cellular biology, and more espe- 

 cially to trace the steps by which the problems of 

 evolution have been reduced to problems of the cell. 

 It was my first intention to publish these lectures in 

 a simple and general form, in the hope of showing to 

 wider circles how the varied and apparently hetero- 

 geneous cell-researches of the past twenty years have 

 grown together in a coherent group, at the heart of 

 which are a few elementary phenomena, and how 

 these phenomena, easily intelligible to those having 

 no special knowledge of the subject, are related to 

 the problems of development. . . The rapid ad- 

 vance of discovery in the meantime has made it 

 seem desirable to amplify the original plan of the 

 work, in order to render it useful to students as well 

 as to more general readers. . . . This book does 

 not, however, aim to be a treatise on general his- 

 tology." 



" The theory of evolution originally grew out of 

 the study of natural history, and it took definite 

 shape long before the ultimate structure of living 

 bodies was in any degree comprehended. . . . The 

 study of microscopical anatomy, in which the cell- 

 theory was based, lay in a different field. . . Only 

 within a few years has the ground been cleared for 

 that close alliance of the evolutionists and the cytolo- 

 gists which forms so striking a feature of the contem- 

 porary biology. . . ." 



" The opening chapter is devoted to a general 

 sketch of cell-structure, and the second to the phe- 

 nomena of cell-division. The following three chap- 

 ters deal with the germ-cells, — the third with their 

 structure and mode of origin, the fourth with their 

 union in fertilization, the fifth with the phenomena 

 of maturation. . . . The sixth chapter contains a 

 critical discussion of cell-organization. ... In the 

 seventh chapter the cell is considered with reference 

 to its more fundamental chemical and physiological 

 properties. . . ." 



IN PREPARATION. 



VOL. VI. THE PROTOZOA. 



By GARY N. CALKINS, Ph.D. 



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, encyst- 

 ment, 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 remainder of the book, with the exception of the last chapter, the Protozoa are considered from the 

 cytological standpoint. Their relation to various cell-theories, physiological and morphological, which have 

 been gradually evolved with the growth of cellular biology, is briefly discussed together with some special 

 problems particularly appertaining to Protozoan cell-organization, such as the origin and morphological signifi- 

 cance of mitosis, chromosomes, archoplasm, centrosomes, etc. While from the physiological standpoint the 

 questions of animals and plants, of conjugation, copulation and the origin of sex, of the chemical and physical 

 relations of cytoplasm, nucleus and environment, and of the so-called psychic phenomena are considered in the 

 light of recent observations and experiments. 



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.Vn. AN INTRODUCTION TO COMPARATIVE 



NEUROLOGY. 



By OLIVER S. STRONG, Ph.D. 



THE MACMILLAN COMPANY, 66 Fifth Avenue, New York. 



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