304 PRINCIPLES OF STOCK-BREEDING. 



as a basis of generalization, and the same objection 

 may be made to the cases collected by Hofacker and 

 Sadler, which we quote from Carpenter : l 



" The following table expresses the average results 

 obtained by M. Hofacker in Germany, and by M. 

 Sadler in Britain, between which it will be seen that 

 there is a manifest correspondence, although loth were 

 drawn from a too limited series of observations. The 

 numbers indicate the proportion of male births to a 

 hundred females, under the several conditions men- 

 tioned in the first column : " 



Hofacker. 



Father younger than mother . . . .90.6 



" and mother of equal age . . . 90.0 



" older by 1 to 6 years . . . 103.4 



" " " 6 " 9 " . . . 124.7 



" " " 9 " 18 " . . . . 143.7 



" " " 18 and more . . . 200.0 



Sadler. 



Father younger than mother .... 86.5 



" and mother of equal age . . % 94.8 



" older by 1 to 6 years . . . 103.7 



" " " 6 " 11 " . . . 126.7 



" " " 11 " 16 " . . . . 147.7 



" " " 16 and more . . , ; 163.2 



" From the statistics recorded in the peerages and 

 baronetages of the United Kingdom, the proportion 

 of male to a hundred female births is stated by Na- 

 pier to be as below : " a 



390 parents of equal age ". . . . . . 91.8 



276 fathers 1 year older than mothers . . . 101.3 



1 " Human Physiology," p. 1016. 



8 Scientific Farmer, 1876, p. 180, credited by Dr. Sturtevant to the 

 Journal of the Anthropological Society ', 1867, vol. cxix. 



