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JOURNAL OF 





H E RE DITY 



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A raoatKly publication devoted to 

 Plant Breediivf;(, Animal Breeding 



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FEBRUARY, 1915 



WAR AND BIOLOGY ------- L. H. Bailey 



TWO CLASSES OF HYBRIDS - - - - O. F. Cook 



PER JUGATE COTTON HYBRIDS - Charles G. Marshall 



E. S. CARMAN ----.-.-- E. M. East 



THE CHROMOSOME HYPOTHESIS OF 



HEREDITY ---------- John Belling 



JERSEY-ANGUS CATTLE - - - - Arthur H. Kuhlman 



TOBACCO MUTATIONS ------ H. K. Hayes 



THE PEOPLING OF AMERICA - - Dr. Ales Hrdlicka 



THE EARLY MARRIAGE QUESTION 



BREEDING FOR HORNS ----- Frank N. Meyer 



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ORGAN OF THE 



AMERICAN GENETIC ASSOCIATION, WasK;n6ton.D.C. 



Printed for Circulation among Memoers Onl/ 





'v V^ U rrinted tor Circulation among iVVembers vJnl/ jl^K^^ 



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