BREEDING SCIENTIFICALLY 17 



Men," has stated a law of cultural limita- 

 tions ; that culture is artificial, rather than 

 natural. Nature makes a strong effort to 

 preserve a mean or average type. The 

 animal or human family degenerates and 

 passes away, chiefly through the direct and 

 indirect action of microbic enemies, which 

 assail a weakened constitution. Humans 

 have not as yet taken the lesson to them- 

 selves ; horsebreeders and fish-growers are 

 the only ones to take up the question of 

 breeding by impregnation in a scientific 

 way. 

 COMBINATION IV. 



A = 60% M. and 40% F. + B." = 

 60% M. and 40% F. = 120% A.B.M. 

 and 80% A.B.F. 



This combination will produce a male 

 colt whose ability and vigor in the stud 

 will be in the relative proportion, as 

 200 A.B.M. is to 120 A.B.M. 

 COMBINATION V. 



A. = 40% M. and 60% F. + B. = 40% 

 M. and 60% F. = 120% A. B. F. and 

 80% A.B.M. 



