1 2 INTR OD UCTION 



ure, and the second to the phenomena of cell-division. The follow- 

 ing three chapters deal with the germ-cells, — the third with their 

 structure and mode of origin, the fourth with their union in fertiliza- 

 tion, the fifth with the phenomena of maturation by which they are 

 prepared for their union. The sixth chapter contains a critical dis- 

 cussion of cell-organization, completing the morphological analysis of 

 the cell. In the seventh chapter the cell is considered with reference 

 to its more fundamental chemical and physiological properties as a^ 

 prelude to the examination of development which follows. The suc- 

 ceeding chapter approaches the objective point of the book by con- 

 sidering the cleavage of the ovum and the general laws of cell-division 

 of which it is an expression. The ninth chapter, finally, deals with 

 the elementary operations of development considered as cell-functions 

 and with the theories of inheritance and development based upon 

 them. 



SOxME GENERAL WORKS ON THE CELL-THEORY 



Bergh, R. S. — Vorlesungen liber die Zelle unci die einfachen Gewebe : Wiesbaden, 



1S94. 

 Delage, Yves. — La Structure du Protoplasma et les Theories sur Tlieredite et les 



grands Problemes de la Biologie Generale : Paris, 1895. 

 Geddes & Thompson. — The Evolution of Sex : Ne-d) York, 1890. 

 Henneguy, L. F. — Lecons sur la cellule : Paris. 1896. 



Hertwig, 0. — Die Zelle und die Gewebe: Fischer, Jena, 1892. Translation, pub- 

 lished by Macinillaii, Londoti and N'ew York, 1895. 

 Huxley, T. H. — Review of the Cell-theory : British and Foreign Medico-Chirurgical 



Review, XH. 1853. 

 Minot, C. S. — Human Embryology: New York, 1892. 

 Remak, R. — Laitersuchungen liber die Entwicklung der Wirbelthiere : BerliUy 



1850-55. 

 Schleideri, M. J. — Beitrage zur Phytogenesis : Miiller's Archiv, 1838. Translation 



in Sydenham Soc, XH. London. 1847. 

 Schwann, Th. — Mikroscopische Untersuchungen liber die Uebereinstimmung in 



der Structur und dem Wachsthum der Thiere und Pflanzen : Berlin. 1839. 



Translation in Sydenham Soc, XII. London, 1847. 

 Tyson, James. — The Cell-doctrine, 2d ed. Philadelpliia. 1878. 

 Virchow, R. — Die Cellularpathologie in ihrer Begrlindung auf physiologische und 



pathologische Gewebelehre. Berlin. 1858. 

 Weismann, A. — Essays on Heredity. Translation: First series, Oxford, 1891 ; 



Second series, Oxford. 1892. 

 Id. — The Germ-plasm. IVew York, 1893. 



