76 PRINCIPLES OF ANIMAL BIOLOGY 



have been provided in different ways. So multifarious are these char- 

 acteristic developments that a group of chapters, immediately following, 

 must be devoted to them. 



References 



Lankester, E. R., editor. A Treatise on Zoology. A. & C. Black, Ltd. (Vol. 1, 



Fascicle I, Introduction.) 

 Sharp, L. W. An Introduction to Cytology. 3d Ed. McGraw-Hill Book Company, 



Inc. (Pp. 20-24, 435-43G, for Organisnial Theory.) 



