furnish a well-marked ground plan of Ichthyology. The figures are mainly original and designed to aid in 

 practical work as well as to illustrate the contrasts in the development of the principal organs through the five 

 groups. 



Published la 1896. Second Edition Revised and Enlarged 1900 



Vol. IV. THE CELL IN DEVELOPMENT AND INHERITANCE 



By EDMUND B.WILSON, Ph.D., LL.D., Professor of Zoology, Columbia University. 370 pages; 

 142 figures in the text. Price $3.50, net. 



Introduction. Chapters I. General Sketch of the Cell. II. Cell Division. III. The Germ Cells. IV. 

 Fertilization of the Ovum. V. Reduction of the Chromosomes, Oogenesis and Spermatogenesis. VI. Some 

 Problems of Cell Organization VII. Some Aspects of Cell Chemistry and Cell Physiology. VIII. Cell 

 Division and Development. IX. Theories of Inheritance and Development. 



" During the few years which have elapsed since the appearance of the first edition of Professor Wilson's 

 book on the cell, the rapid accumulation of new facts has resulted in the modification, in many important 

 respects, of the views which were entertained concerning many cell phenomena even so lately as five years 

 ago. Hence, though the volume before us is issued as a second edition, it has not only been considerably 

 enlarged, but also much of the original matter has been replaced to make room for new treatment which shall 

 more faithfully reflect the attitude of cytologists toward the problems which confront them at the present time. 

 And we may fairly say, that the author's efforts have not only been largely successful, but they have resulted 

 in the production of one of the best works which it has been our good fortune to meet with for a long time. 

 The whole subject is handled in an easy and masterly fashion, and the reader is enabled readily to grasp the 

 leading facts and to obtain a clear insight into the nature of the chief questions of cytological importance." 

 J. B. FARMER, Nature, 1901. 



Published la 1899 



Vol. V. THE FOUNDATIONS OF ZOOLOGY 



By WILLIAM KEITH BROOKS, Ph.D., LL.D., Professor of Zoology in the Johns Hopkins Uni- 

 versity. 339 pages. Price $2.50, net. 



Contents. Lectures I. Introductory. II. Huxley and the Problem of the Naturalist. III. Nature and 

 Nurture. IV. Lamarck. V. Migration in its bearing on Lamarckism. VI. (i) Zoology and the Philosophy of 

 Evolution. VI. (n) An Inherent Error in the Views of Gallon and Weismann on Inheritance. VII. Gallon 

 and the Statistical Study of Inheritance. VIII. Darwin and the Origin of Species. IX. Natural Selection 

 and the Antiquity of Life. X Natural Selection and Natural Theology. XI. Paley and the Argument from 

 Contrivance. XII. The Mechanism of Nature. XIII. Louis Agassiz and George Berkeley. 



" It is a peculiar pleasure to a British naturalist to find the Darwinian principle illustraled and defended 

 with such remarkable force and success by a dislinguished American zoologist." Nature, October 18, iqpo. 



" Brooks' lectures on ' The Foundation of Biology' constitute 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, April 14, 1899. 



" Without copious extracts it is impossible to do justice to this masterly presentation of the subject. The 

 chapter abounds in aphorisms, as indeed do other portions of the work ; and these alone, if serially collected 

 with their contexts, would make a valuable little handbook for the student of biology." Popular Science 

 Monthly. June, 1899. 



Published la 1901 



Vol. VI. THE PROTOZOA 



By GARY N. CALKINS, Ph.D., Professor of Invertebrate Zoology, Columbia University ; Biolo- 

 gist, State Cancer Laboratory, Buffalo, N.Y. 347 pages. Price $3.00, net. 



A General Introduction to the Study of Protozoa. IN NINE CHAPTERS. I. Introductory. With 

 historical review ; modern classification ; animals and plants, and generation de novo. II. General Sketch. 

 Including general morphology ; general physiology, and economic aspects. III. The Sarcodina. Shells 

 and tests, and special locomotor and other organs. IV. The Mastigophora. General and special organization. 

 V The Spirozoa. General and special organization ; mode of life, and relations. VI. The Infusoria. Gen- 

 eral organization of ciliata and suctoria. VIII. Sexual Phenomena. Significance of conjugation and rise of 

 sex. VIII. The Protozoan Nucleus. Special Morphology. The phylogenetic relations of the nucleus and 

 mitotic figure. IX. Some Problems in the Physiology of the Protozoa. The phenomena of digestion, 

 respiration, secretion, and irritability. 



" The author has not aimed at putting forward an exhaustive, severely scientific treatise upon the group 

 in question. His work may be described rather as a simple and intelligible introduction to the study of the 

 Protozoa and of the many fascinating biological problems connected with, or illustrated by, this subdivision of 

 the animal kingdom, in such a way as to awaken the interest of the beginner, no less than to strengthen the 

 hands of the expert." Nature. 



