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CRITIQUE OF THE ELEME^^TALIST CONCEPTION OF THl. 



ORGANISM 



B. The Production of Individiuils by Other Iiulir'nlual.s {<'i,iirlii(ltii) 



CHAPTER PACK 



XIV. Evidence from Metazoax Germ-Cells That Substances 



Other Than Chromatin Are the Physical Bases of 

 Heredity .......... I 



Evidence from spermatozoa, 1. Spermatozoa sultjcrf to 

 heredity as well as "bearers of heredity," 1: (a) ////<.*- 

 trated by the ontogeny of mamm^ilian sperm, 4; {b) Illus- 

 trated by the ontogeny of an insect sperm, 9. Evidence frt^m 

 the ovum, 15: (a) eggs of ascidians — the facts, HI; (b) 

 Conklin's interpretation, 19. Critical examinatix)n of Conk- 

 lin's interpretation, 23. 



XV. Evidence from Somatic Histogenesis in the Mui.ticei.i ri.vR 



Organisms 32 



The mitochondrial theory of heredity, 32. The mitochon- 

 drial theory tested by the ontogeny of spermatozoa, .ill. The 

 mitochondrial theory tested by histogenesis. ,/,\ The un- 

 tenable hypothesis that cytoplasm of the ovum /.v inheritance 

 material for general but not for special characters, /fO. Spe- 

 cies attributes in single cells of adult (nganisnis. //.I. The 

 spiwules of the ascidian genus slyela, Jf.'f. The spicuhs of 

 sponges and other invertebrates, oO. The "hair.s" of hight r 

 phmts, 55. Cell~7vall structures in hightr plants, 57. The 

 morphology of striated muscU ptx'rs, 60. Tlw physiology of 

 muscle fibers, 61. Summary of positive information tUxuif 

 the physical bajtis of heredity, 6'f. 



XVI. The Inheritance Materials of Gehm-Cei.i.s Initiators 



Rather Than Determiners ...... Ctd 



Antecedents of the cytoplasmic and nuclear thiories of i»»- 



ix 



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