Th 



e 



Journal of Heredity 



(Formerly the American Breeders' Magazine) 



Vol. IX, No. 2 February, 1918 



CONTENTS 



A Plant Industry Based upon Mutation, by Thomas H. Kearney. . .. 51 



Why the But ton -Ball Degenerates in Towns 61 



Why the Babies Die, by the Editor .' 62 



Motherhood (Review of a Book by C. Gasquoine Hartley) 66 



Vocational Guidance in Music. . . 66 



Small Grain Investigations, by H. H. Love and W. T. Craig 67 



Cell Intelligence the Cause of Evolution (Review of a Book by Nels 



QiicvU) 76 



Heredity and Disease, by Charles Herrman 77 



Influence of Environment on Tree Growth 80 



Chry'santhemum Varieties, by A. D. Shamel 81 



Ohio Conserving Superior Seed Corn 84 



A Striking Reproductive Habit, by Alfred A. Hansen 85 



Decline of Birth Rate in Hungary 85 



Color Inheritance in Mammals: IX, The Dog, by Sewall Wright. ... 87 



Longevity in Lily Pollen 90 



Meanings of Genetic Terms 91 



Selection of Plant Breeding, by John Belling 95 



Rise in New Zealand Lambing Percentage 95 



Polydactylism and Tooth Color, by S. Sinha 96 



Horse Bieeding in Hrszil 96 



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 

 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 rnatter February 24, 1915, at the postoflfice at Washing- 

 ton, D. C, under the act of August 24. 1912. Contents copyrighted 1917 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, J.wr.vRY 28, 1918. 



