The 



Journal of Heredity 



(Formerly the American Breeders' Magazine) 



Vol. IX, No. 6 October, 1918 



CONTENTS 



Absence of Xcnia in Ostrich Eggs, by J, E. Duerden 2i."} 



Why Navel Oranges Are Seedless, by A. D. Shamel 216 



Stallion Enrollment Work for 1917 in Indiana 249 



Butter Fat Percentage Independent of Age of Com 2 19 



The Cow in Calf Deserves More Honor, by I. T. Hooper 250 



Artificial Hybrids betMcen Pike and Pickerel, by G. C. Embody 253 



Is War Necessary? by Paul Popenoe 257 



Wanted! Photographs of Twins 262 



Hybrids of the Live Oak and Overcup Oak, by H. Ness 263 



Mentality of the Arriving Immigrant 268 



Will Morality Disappear? by Paul Popenoe 269 



Inherited Feeding Habit of Herons, by John T. Zinimer 271 



China's Trees and Ours Strikingly Alike 272 



LoM'cred Birth Rate in Germany and Hungary 281 



Bee Keeping May Increase the Cotton Crop, by R. M. Meade 282 



Counting the Feeble-minded in New York 285 



NOTE 



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

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

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

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

 Next year, if war conditions are no more unfavorable than this year, 9 numbers 

 will be published. 



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' Associaiton) 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 postoflSce at Washing- 

 ton, D. C, under 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, November 13, 1918. 



