422 APPENDIX 



PETKUNKEVITCH, ALEXANDER. Morphology of Invertebrate Types. 

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

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

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

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



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

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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 

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

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

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



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

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

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

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



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

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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 



