The 
Journal of Heredity 
(Formerly the American Breeders’ Magazine) 
May-JuNE, 1920 
Von SLNO:5 
CONTENTS 
See Special Note Below. 
The Colombian Berry, or Giant Blackberry of Colombia, by Wilson Popenoe.. 195 
Environment and Breeding as Factors Influencing Milk Production, by An- 
drews Cr WicCandlsh:, Siactatenee pers seca cea es meen Say hee Wrevesh' e ahye whovens 204 
Heredity in Horses, by H. K. Bush-Brown............................. 215 
A New Genetics Journal—‘‘Hereditas”....................0.00222205.. 227 
The Menace of the Half-Man, by Seth K. Humphrey. : ; Sh iereeS 
A Graft-Chimera in the Apple, by A. B. Stout... : ; 14233 
Breeding Earless Sheep, by E.G. Ritzman................ Sa aweets 
NOTE 
The Journal of Heredity at the original pre-war price of only $2.00 ran into a 
raise of fully 100% in the cost of its manufacture. The membership dues did not 
cover the costs, and support was difficult to arrange for, but the necessary financial 
assistance has been secured, and four bi-monthly numbers will now appear in quick 
succession to complete Volume eleven (1920). The Journal will then resume its 
regular schedule at the price of $3.00 determined upon by the Council last June. 
Canadian members pay $3.25 and foreign members $3.50, the extra amount 
being necessary to pay postage. Price of single copies 35 cents. 
The next numbers will contain illustrated accounts of some of the most impor- 
tant discoveries which have yet been made in this new field of science, and it is 
hoped will satisfy those members to whom the long wait for the Journal has been 
discouraging. 
The interest in the subject of heredity is growing rapidly, and if each member 
would nominate a few friends who are eligible the Association will be self-supporting 
next year. 
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 HeReEpitTy (Organ of the American Genetic Association), Washington, D. C. 
Date of issue of this number, January 20, 1921 
