256 EFFECTS OF SEXUAL REPRODUCTION. 



It will thus be seen that sexually developed characters trans- 

 ferred from one sex to the other are those characters which are 

 functionally developed, and that the transference is not from an 

 individual of one sex in one generation to an individual of the 

 opposite sex in the second generation, but through an individual 

 of the same sex in the second generation to one of the opposite sex 

 in the third generation. 



Good examples of this transference of acquired development to 

 the opposite sex in the third generation are found in the pedigrees 

 of trotting horses. The highly trained stallion George Wilkes does 

 not appear as the sire of any of the very fast mares, but he appears 

 ten times as the sire's sire and as many more times as the sire's 

 grandsire. For mares, the grandsires and great-grandsires are 

 almost as old as they are for stallions. 4 



(4) This matter is examined at length in articles on "The Origin of 

 Speed," in "The Horseman," Chicago, of Dec. 2, 1902, and Jan. 13, 1903. 



