18 BOARD OF AGRICULTURE. [Pub. Doc. 



difference, and does mean all the difference between success 

 and failure. 



ISTow, on the other question, the reason that we cannot write 

 into the gamete, evidently, a factor for milk and a factor 

 for scrub is that the factor for milk probably is a half dozen 

 factors ; it is constitution ; it is development of lungs ; it is 

 development of heart ; it is capacity for food ; digestion ; the 

 character of the udder ; the size of the udder, — all these 

 things go to make up the milk-producing factor, and I am 

 satisfied that if there is any possible way, and there may be 

 some day, — just as Dr. Pearl thinks he has found the factor 

 which makes for heavy egg production, — I say that there 

 may some day be found some way of isolating enough of these 

 factors to give a fair idea of what we must expect. Dr. Pearl 

 told me that he thought it would be possible, with the male, 

 with the sire, to find the number and the individuals that 

 had the double dose of the things we wanted, — to put it in 

 that crude way, — by certain methods of inspection of 

 the offspring, and calling attention to the fact that these 

 great sires I spoke about a moment ago would be potent and 

 mark themselves more strongly than any of the rest of their 

 associates on their breed, and the race possibly could be ex- 

 plained in some such way as the male birds can be explained. 

 But I think that the difficulty of getting at your 75 or 25 

 per cent is the number of factors that are involved. 



