010 



circle of those who begin to appreciate the significance of those laws, 

 it must inevitably follow that general breeding practice will thereby be 

 gradually raised. It is not possible for a geneticist, however broad 

 his knowledge, to map out rules of procedure in breeding operations such 

 that success must inevitably follow their application. Such procedure 

 is not to be commended; it is not even scientific, by very nature. For 

 intelligent application of the principles of genetics, which is the ideal 

 of the scientific animal breeder, presupposes a knowledge of such prin- 



FIG. 239. Genetics laboratory (for general course) College of Agriculture, University of 



California. 



ciples; the service of the geneticist, therefore, should be to determine 

 principles and to indicate insofar as may lie within his power the signifi- 

 cance of these principles. 



It is in this direction that the study of genetics is not only advisable 

 but needful, for it provides as it were the framework to which the breeder 

 may add the necessary empirical elements for the construction of his 

 finished plan of procedure. And he will find as he becomes more and 

 more familiar with that framework that it is not a mere indifferent 

 edifice to which he may attach things here and there as convenience 

 dictates, but that it is a coordinated and interrelated structure which 

 provides definite places for different kinds of things, so that when 



