Vlll CONTENTS 



Section VIII. Human Genetics 



55. Genetics of the Human Mind. Dr. C. C. Hurst, Cambridge, England 409 



56. Heredity in Psychoses. Dr. G. P. Frets, Rotterdam, Holland 417 



57. Remarks on the Explanation of Heterosis. Professor Corrado Gini, Rome, Italy. 421 



58. Some Results of a Family History Study. Dr. Morris Steggerda, Carnegie 



Institution of Washington, Cold Spring Harbor, N. Y 425 



59. Sex-Ratio of New Born Infants as an Index of Vitality. Professor V. Bunak. 



Moscow, U. S. S. R 431 



60. Bloodgroups and Inbreeding. Dr. M. A. van Herwerden, University of Utrecht, 



HoUand 436 



61. Is Eugenics Half-Baked? Robert Cook, Washington, D. C 441 



62. Sex Differences in the Expression of Autosomal Genes Affecting Human Denti- 



tion. Dr. F. B. Hutt, University of Minnesota 447 



63. The Inheritance of Mental Test Abilities. Professor Roswell H. Johnson, Uni- 



versity of Pittsburgh. 453 



64. A Note on Inherited Variations and Fitness Problems. William W. Graves, 



M.D., St. Louis University School of Medicine, St. Louis, Missouri 457 



65. Merging of Ancestral Lines. Anita Newcomb McGee, M.D. Southern Pines, 



N. C 483 



PART II. THE EXHIBIT 



The Opening -. 486 



Classification of Exhibits 486 



In Entrance Hall 487 



In Main Hall. 487 



Booth I — Anthropology 489 



Booth II — Physical Anthropometry 490 



Booth III — Special Capacities 492 



Booth IV — -The Inheritance of Racing Capacity in the Thoroughbred 



Horse 494 



Booth V — The Measure of Racing Capacity in the Thoroughbred Horse 495 



Booth VI — Model Eugenics Library 495 



Booth VII— The Eugenics Book Store 496 



Booth VIII— The Special Senses 496 



Booth IX— Heredity 498 



Booth X — Heredity and the Endocrines 500 



Booth XI— Heredity of Mental Defects 501 



Booth XH-Population Analysis 502 



Booth XIII — Population Analysis. 503 



Booth XIV— Heredity of the Eye 504 



Booth XV— Taste Thresholds '. 505 



Booth XVI— Ethnic Survey 505 



Booth XVII— Cancer 505 



Booth XVIII— Italian Demography 505 



Booth XVIX— Laboratory for Child Study 506 



Booth XX— Laboratory for the Study of Race Problems 506 



Booth XXI — Social Hygiene and Eugenics 506 



Cases I to VIII— (Opposite Booths 14 to 21, Third Floor Exhibit) The 

 Natural History of Man 507 



