422 APPENDIX 



PETRUNKEVITCH, ALEXANDER. Morphology of Invertebrate Types. 

 The Macmillan Co., 1916. 



PRATT, H. S. A Manual of the Common Invertebrate Animals, 

 Exclusive of Insects. A. C. McClurg & Co., 1916. 



REYNOLDS, S. H. The Vertebrate Skeleton. 2d edition. Cam- 

 bridge University Press, 1913. 



SHIPLEY, A. E. and MACBRIDE, E. W. Zoology. The Macmillan 

 Co., 1901. 



WALTER, H. E. The Human Skeleton. The Macmillan Co., 1918. 



WARD, H. B. and WHIFFLE, G. C. Fresh-Water Biology. John 

 Wiley & Sons, 1918. 



WILDER, H. H. History of the Human Body. H. Holt & Co., 1909. 



CHAPTER XVI 



CALKINS, G. N. Biology. H. Holt & Co., 1917. 



CHILD, C. M. Senescence and Rejuvenescence. University of 

 Chicago Press, 1915. 



CONKLIN, E. G. Localization of Morphogemtic Substances in the 

 Egg. J. B. Lippincott Co., 1922. 



DRIESCH, HANS. Science and Philosophy of the Organism. Gifford 

 Lectures, 1907-08. A. & C. Black. 



GEDDES, P. and THOMSON, J. A. Sex. H. Holt & Co., 1914. 



HEGNER, R. W. The Germ-cell Cycle in Animals. The Mac- 

 millan Co., 1914. 



HUXLEY, T. H. "Biogenesis and Abiogenesis." Collected Essays, 

 Vol. Discourses Biological and Geological. 



JENNINGS, H. S. Life and Death, Heredity and Evolution in Uni- 

 cellular Organisms. Gorham Press, 1920. 



KELLICOTT, W. E. Chordate Development. H. Holt & Co., 1913. 



LILLIE, F. R. Problems of Fertilization. University of Chicago 

 Press, 1919. 



MORGAN, T. H. Regeneration. Columbia University Press, 1901. 



WEISMANN, AUGUST. The Germ Plasm. Chas. Scribner's Sons, 1892. 



WILSON, E. B. "The Problem of Development." Science, 1905. 



WOODRUFF, L. L. "The Origin of Life," in the Evolution of the 



