The 



Journal of Heredity 



(Formerly the American Breeders' Magazine) 

 Vol. XII, No. 2 February, 1921 



CONTENTS 



ROUND TIP TOBACCO— A PLANT MADE TO ORDER, by E. M. East 



and D. F. Jones 



BREEDING EARLESS SHEEP, by Chr. Wriedt 56 



INHERITANCE IN SWINE, by Jay L. Lush 57 



GENETICS AND EUGENICS (REVIEW) 71 



ORIGIN AND DEVELOPMENT OF THE NERVOUS SYSTEM, A RE- 

 VIEW by Sewall Wright 72 



FEWER BIRTHS IN THE UNITED STATES 75 



THE SOCIAL HYGIENE MOVEMENT (REVIEW) 75 



HERITABLE CHARACTERS OF MAIZE— SHRUNKEN ENDOSPERM, 



by C. B. Hutchison 76 



FELLOWSHIP IN CROP BREEDING 83 



POLYDACTYLISM IN CATTLE, by Elmer Roberts 84 



A TOOTHLESS TYPE OF MAN, by K. I. Thadani 87 



THE DISEASES OF INFANCY (REVIEW) 88 



INBREEDING AND CROSSBREEDING, by J. L. Collins 89 



INHERITANCE OF MENTAL TRAITS, A REVIEW OF STARCH'S 



"EDUCATIONAL PSYCHOLOGY" by Paul Popenoe 93 



The Journal of Heredity is published monthly by the 



AMERICAN GENETIC ASSOCIATION 



Publication office, 450 Ahnaip Street, Menasha, Wis. 



Editorial and general offices, Washington, D. C. 



The Journal of Heredity is published by the American Genetic Associa- 

 tion for the benefit of its members. Canadian members who desire to receive 

 it should send 25 cents a year, in addition to their regular membership dues of $3.00, 

 because of additional postage on the magazine; foreign members pay 50 cents extra 

 for the same reason. Subscription price to non-members, $3 . 00 a year, foreign post- 

 age extra; price of single copies, 35 cents. 



Entered as second-class matter May 13, 1921, at the postoffice at Menasha, 

 Wisconsin. Acceptance for mailing at the special rate of postage provided for in 

 Section 1103, Act of October 3, 1917, authorized Dec. 20, 1918. Contents copy- 

 righted 1921 by the American Genetic Association. Reproduction 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 (Organ of the American Genetic 

 Association, Washington, D. C), Menasha, Wisconsin. Address all communications 

 to the Association's office at Washington, D. C. 



Date of issue of this number, July 11, 1921. 



