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Journal of Heredity 



(Formerly the American Breeders' Magazine) 



Vol. V, No. 10 



October, 1914 



CONTENTS 



Nature of Mendelian Units, by G. N. Collins 425 



A Warning to Eiigenists 430 



The Wisconsin Marriage Law 430 



Tree Growth and Seed, by James B. Berry 431 



Eugenics in Germany, by G. von Hoffmann 435 



For An Exhibit of Hybrids 436 



Holstein Milk Yield, by F. R. Marshall 437 



The Siamese Pomelo by H. H. Boyle 440 



New Publications: Die Ziichtung der landwirtschaftlichen Kul- 



turpflanzen, von C. Fruwirth 444 



Breeding Australian Opossums, by B. Harrison 444 



Standards for Graphs 444 



Origin of Karakul Sheep, by Dr. C. C. Young 445 



Alfalfa Hybridization, by William Southworth 448 



Constructive Eugenics, a Review by the Editor 458 



Negro-Ute Metis, by Albert N. Gilbertson 463 



High Altitude Maize, by A. Jay Garrison 464 



Racial Hybridization, by Eugen Fischer 465 



Prizes Offered for Photographs of Large Trees 469 



The Journal of Heredity is published monthly by the American Genetic 

 Association (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, because of additional post- 

 age on the magazine; foreign members pay 50 cents extra for the same reason. 

 Price of single copies, 25 cents. 



Entered as second-class matter August 27, 1912, at the postofifice at Washington, 

 D. C, under the act of August 24, 1912. Contents copyrighted 1914 by the 

 American Genetic Association. Reproduction of articles or parts of articles 

 permitted provided proper credit is given to author and to the Journal of Heredity 

 (Organ of the American Genetic Association), Washington, D. C. 



Date of issue of this number, vSeptember 25, 1914. 



