The 
Journal of Heredity 
(Formerly the American Breeders’ Magazine) 
Vol. XI, No. 4 April, 1920 
CONTENTS 
Special Notice to Members...................0.-2+0:: Inside front cover 
Native Horses and Cattle in the Orient, by C. O. Levine........... 147 
Origin of a Grapefruit Variety Having Pink Colored Fruits, by A. D. 
POL eon 0 Cl lee etree GBI ©. os Ger, SACRE Re tee ee sp eae ritegias Eee 157 
Defective Seeds, by D. F. Jones... .. 161 
Heritable Characters of Maize 
Foreign Plant Introduction Medal, by David Fairchild. ....... .. 169 
Cotton a Community Crop, by O. F. Cook... .............. wee a 
Are Our Raspberries Derived from American or European Species, by 
Ceor Mi Marrowave cis aoe ces ee. yal is naheed evel eo ee sos So etk 
An Abacus for Illustrating the Structure and Mathematics of the 
Human Germ-Plasm, by Harry H. Laughlin... . 1 .. 185 
Moral Qualities and Eugenics.....................-- Shae 189 
A Physical Census in England and [ts Lessen, by F. A. Woods...... 190 
A System for Breeding Corn or Gregarious Animals, by A. N. Hume. 191 
Race and Nationality—a Review........ 0.0.5.6. .000 cc ceeeseeeees de LOD 
The JOURNAL OF HEREDITY is published monthly by the American Genetic As- 
sociation (formerly called the American Breeders’ Association) 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 $2.00, because of additional postage 
on the magazine; foreign members pay 50 cents extra for the same reason. Sub- 
scription price to non-members, $2.00 a year, foreign postage extra; price of single 
copies, 25 cents. 
Entered as second-class matter February 24, 1915, at the postoffice at Washing- 
ton, D. C., under the act of August 24, 1912. Contents copyrighted 1920 by the 
American Genetic Association. Reproduction of articles or parts of articles per- 
mitted, upon request, for a proper purpose, and provided due credit is given to 
author and to the JoURNAL OF HErRepITy (Organ of the American Genetic Associa- 
tion), Washington, D. C. 
Date of issue of this number, June 6, 1920. 
