410 PRINCIPLES OF STOCK-BREEDING. 



281 days, and two-fifths of them having exceeded 289 

 days." ' 



From the facts that have been presented it appears 

 that the size, early maturity, and inherited tendencies, 

 may all have an influence in determining the duration 

 of gestation. 



The wide range of variations that occur in the 

 same family, and even in individuals, seems to indi- 

 cate that there are other and perhaps more efficient 

 influences that have escaped our attention. 



1 Carpenter's " Human Physiology," p. 982. 



