378 



The Journal of Heredity 



now credited her, largely through the 

 use of the variety Rosen Rye. 



However, we should not neglect all 

 the other factors which enter into the 

 production of a good crop of rye, such 

 as proper use of manure, acid phos- 

 phate, and thorough preparation of the 

 seed-bed. For a maximum crop of 

 Rosen Rye, seeding should be done the 

 first half of September at the rate of 

 four to five pecks per acre. October 

 seeding should be made at the rate of 

 six pecks per acre. 



Realizing the value of the variety and 

 the necessity for high standards of pur- 

 ity and freedom from weeds, the Michi- 

 gan Crop Improvement Association has 

 introduced an inspection of this and 

 other pedigreed grains. Any farmer 

 can become a member of this associa- 

 tion on payment of the annual dues of 



one dollar, but in order to sell his grain 

 under the trademark of the association, 

 he must submit it to inspection by its 

 agents and pay all attendant costs. The 

 requirements to pass inspection include 

 a clause demanding 99^ purity of 

 variety, freedom from quack grass, 

 mustard and dodder, and not to exceed 

 one-half of 1% weed seeds. To sum 

 it up, inspected Rosen Rye must be 

 good, pure, and thoroughly recleaned 

 seed. 



Lists of growers whose Rosen Rye 

 has passed field inspection will be avail- 

 able August 1, 1917, and can be secured 

 on request from J. W. Nicolson, Sec- 

 retary of Michigan Crop Improvement 

 Association. On receipt of this list, a 

 prospective buyer can get in touch with 

 producers of Rosen Rye. 



Further Evidence that "Like Marries Like" 



Donald M. Marvin has published in 

 the September number of the Publica- 

 tions of the American Statistical Asso- 

 ciation some new facts confirming the 

 theory that "like tends to mate with 

 like." His chief conclusions are here 

 quoted : 



"The presence of a large and increas- 

 ing number of women in industry 

 raises the question of the possible in- 

 fluence of industry upon marriage 

 selection. Modern social conventions 

 are based upon the presumption that 

 woman is shut away in the home and 

 that man must follow her there if he 

 wishes to see her. In entering indus- 

 try in such large numbers, women 

 face two new conditions, one negative, 

 the other positive. They leave the 

 home temporarily empty and they 

 create a new social phenomenon of 

 occupational propinquity. This, modi- 

 ficfl by the various influences of class 

 stratification, financial status, and other 

 forms of group cohesion involved in 

 the present organization of society, 

 tends to difi'ercntiatc certain groups 

 of men and women for marriage. 



"Industrial propinquity extends to the 

 home and to the economic status. 



Even class and race lines enforce 

 occupational cohesion. Such stratifica- 

 tion and drawing together of certain 

 parts of social groups must react 

 variously upon those involved. It 

 seems possible that friends who marry 

 within their own occupation are not so 

 much guided by similar tastes and 

 backgrounds as they are driven by a 

 new force of industrial propinquity, a 

 force that has developed with the ap- 

 pearance of woman in industry. 



"Marriage, a matter of individual 

 choice, if choice exists, obeys the 

 sweeping silent force of propinquity. 

 Women in each occupation are sur- 

 rounded by the men of the same occu- 

 pation. Of course they marry these 

 men. This inevitable sequence causes 

 no astonishment. 



"Today the most attractive as well as 

 the strongest and most vigorous women 

 arc in industry. Their presence has 

 been accepted and the taboo has been 

 removed. The result is that men are 

 now marrying the women whom they 

 meet in their work. The tremendous 

 proportions of this movement are of 

 startling and far-reaching significance. 



"The data were derived fnun the 



