The 
Journal of Heredity 
(Formerly the American Breeders’ Magazine) 
VoL. XI, No. 6 Juty-Aucust, 1920 
CONTENTS 
The Reindeer Industry in Alaska, by G. J. Lomen........:.................. 243 
The Herald—A New Type of Prune, by L. R. Detjen........................ 253 
Race Assimilation by the Pure-Sire Method, by Harry H. Laughlin............259 
The Tree Dahlia of Guatemala, by Wilson Popenoe......................... 265 
Chlorophyll Factors of Maize, by E. W. Lindstrom........................... 269 
Mutations in Mucors, by Albert F. Blakeslee.............0 000.00. c cee ee 278 
A Random Test in the Theory of Protective Coloration, 
byabrederickyAdams™WOOdS >. 2.5 10-0 te uate ery ine te elas se ee ave atest ears 284 
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 postage extra; 
price of single copies, 25 cents. 
Application has been made for entry as second-class matter at the postoffice 
at Menasha, Wisconsin. Contents copyrighted 1920 by the American Genetic As- 
sociation. 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 
or HereEpity (Organ of the American Genetic Association), Washington, D. C. 
Date of issue of this number, February 5, 1921 
