312 



PRINCIPLES OF STOCK-BREEDING. 



Of other countries the following statistics are 

 given : 



Amsterdam and Frankfort, with England, seem to 

 form exceptions to the rule indicated by the statistics 

 of other localities. 



In Michigan the proportion of males to 100 females 

 in 1870 was 108.1 for illegitimate, and 108.8 for all 

 births ; and in 1871 it was 80.0 for illegitimate, and 

 110.29 for all births. 2 



In Massachusetts, for twenty-three years, the pro- 

 portion of male to female birjbhs, of all classes, was 

 107.7 to 100, while for illegitimate for the same pe- 

 riod it was 93.4 to 100. 8 



It has been stated that "the first children of a 

 marriage consist of a greater number of females and 

 fewer males, in the proportion, according to Burdach, 

 of 53 male births to 100 females," * and this may per- 



1 "Insurance Cyclopaedia," vol. i., p. 316. 



8 Michigan " Fifth Registration Report," 1871, pp. 93, 94. 



3 Scientific Farmer, 1876, p. 166. 



4 " Cyclopaedia of Anatomy and Physiology," vol. ii., p. 478. 





