VI CONTENTS. 



Page 

 Part III. Family studies of build — Continued. 



B. Discussions of special matings — Continued. 



Class V. The back cross 119 



Mating 1. Heterozygous medium or fleshy X slender 119 



Mating 2. Fleshy X heterozygous fleshy parents 132 



Summary and discussion 140 



C. General discussion 141 



Heredity and environment in build 141 



Endocrine glands as links between chromosomes and somatic qualities .... 145 



Evidence of segregation in the heredity of build 146 



On the number of factors involved in fleshy build 149 



D. Summary of conclusions 152 



Appendix 155 



Literature cited 175 



Plates 177 



