The 



Journal of Heredity 



(Formerly tke American Breeders' Magazine) 



Vol. X, No. 3 March, 1919 



CONTENTS 



The Founders of the Art of Breeding, by Herbert F. Roberts 99 



Better American Families III, by Wilhelmine E. Key 107 



Mutations in the Jimson Weed, by A. F. Blakeslee and B. T. Avery, Jr. . . Ill 

 The Determination of Disputed Parentage as a Factor in Reducing 



Infant Mortality, by Roswell H. Johnson 121 



Immigration Restriction and World Eugenics, by Prescott F. Hall 125 



Two Striking Color Variations in the Green Frog, by P. W. Whiting. . . 127 



Bud Variations in Sugar Cane, by Carl S. Pomeroy 129 



New Pillar Rose, by W. Van Fleet 136 



Biology and Politics, by Walter Sonneberg 139 



The Increase, Diffvision, and Decline of the Mayflower and Other New 



England Stock, by J. Gardner Bartlett 141 



Variation, Selection and Mutation in One of the Protozoa 143 



NOTE 



Instead of raising the price of membership, and in order to meet the require- 

 ments of the War Industries Board, and also because of the drafting of the 

 whole Editorial Staff the July, August and September numbers have been 

 dropped out for 1918. Vol. IX contains only 8 instead of 12 numbers. 



The Journal of Heredity is published monthly with the exception of July, August 

 and September 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 postage on the magazine; foreign members pay 50 

 cents extra for the same reason. Subscription 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 postoflfice at Washing- 

 ton, D. C, vmder the act of August 24, 1912. Contents copyrighted 1918 by the 

 American Genetic Association. Reproduction of articles or parts of articles per- 

 mitted provided proper credit is given to author and to the Journal of Heredity (Or- 

 gan of the American Genetic Association), Washington, D. C. 



Date of issue of this number, April 25, 1919. 



