The 
Journal of Heredity 
(Formerly the American Breeders’ Magazine) 
Vol. XI, No. 3 March, 1920 
CONTENTS 
A Disorder of Cotton Plants in-China: Club-leaf or Cyrtosis, by 
ORE Cookie. cote cer eiotas fos 2 > Ree Rae sec mates tees 99 
Enigenies/in Gemmaanys 14.1. 2 60:2) aes: + caps bes nosis eee ss are es 110 
Rock?s iast Work—a> reviews .s2 = <<. Sarton sie tcc = ai clergy = sie] 8 sve 110 
Heritable Characters of Maize—III Brachytic Culms, by J. H. 
LISCOSTII OT) he ae os epoca We aA MR” 7 ceo ery eis RARE Ser y Oem BE 111 
Mendelism—a reviews. 5.28.0 52 &-, «~ Ween onesie ote eetedel ss pee are 115 
Swine, Sheep and Goats in the Orient, by C. O. Levine............ 117 
Inbreeding and Outbreeding—a review by Paul Popenoe............ 125 
PUI SEMICS iN SCAMOMIAVIA ys ole. 2, ps) 5 SAR, eee hs, crear oi ene ioe 128 
Natural Wheat-Rye Hybrids of 1918, by Clyde E. Leighty........... 129 
World Power and Evolution—a review by Paul Popenoe............ 137 
The Journal of Heredity is published monthly by the American Genetic Associa- 
tion (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 HEreEpiTy (Organ of the American Genetic Associa- 
tion), Washington, D. C. 
| 
The Physical Basis of Heredity—a review.....................0..... 144 
Date of issue of this number, May 6, 1920. 
