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Journal of Heredity 



Vol. X1\'. No. 7 October, 1923 



CONTENTS 



THE THYROID GLAND AND DEVELOPMENT 



Frederick S. Ham mett 29 1 



SOCL^L CONFLICT AND EDUCATION (A Review) 206 



HERITABLE CHARACTERS OF MAIZE XV— GERMLESS SEEDS 



M. Demerec 29; 



THE OLD AMERICAN STOCK (A Review) 300 



PROLIFIC AND OTHER DWARF OATS T. R. Staxtox 301 



A NEW EDITION OF THE "LIVESTOCK OF GREAT BRITAIN" 



(A Review ) 305 



A HANDBOOK OF HUMAN BIOLOGY (A Review) 306 



EUGENICAL STERILIZATION (A Review) 308 



FEMALE PURE-BRED LIVESTOCK SHOWS RAPID INCREASE.. 310 



TWINS AGAIN Albert Edward Wiggam 311 



MALFORMATIONS OF COTTON PLANTS IN HAITI.. O. F. Cook 323 



HEREDITY AND EUGENICS (A Review) 336 



The JOURNAL OF HEREDITY is published monthly by the 



AMERICAN GENETIC ASSOCIATION 



At 1918-32 Harford Avenue, Baltimore, Md., and Washington, D. C. 



Address communications regarding editorial matters and the business management of the 

 Association to Box 354, Penna. Ave. Sta., Washington, D. C. 



Entered as second class matter February 24, 1923, at the post office at Balti- 

 more, Maryland. Acceptance for mailing at the special rate of postage 

 provided for in Section 1103, Act of October 3, 1917, authorized December 20, 

 1918. Contents copyrighted 1923 by the American Genetic Association. Re- 

 production of articles or parts of articles permitted only upon request, for a 

 proper purpose, and provided due credit is given to author and to the 

 JOURNAL OF HEREDITY, Washington, D. C. 



Date of Issue of This Number, November 5, 1923. 



