196 THE POULTRY-BOOK. 



Among- mulattoes, where both male and female are of the 

 second generation, there is no product resulting from copula- 

 tion ; though either will produce when united to one of the first 

 or third generation, or with a white or black. 



4. Where animals of the same order, genus, and species 

 cohabit, all the ova which are fully matured and perfected, are 

 impregnated either with or without the venereal orgasm on the 

 part of the female. In the human species, whatever number 

 of ova are matured and susceptible of impression at the time 

 of any specific coitus, are impregnated, be they more or less. 

 Hence, we frequently hear of twins, triplets, and even quadru- 

 plets, and superfoetation sometimes takes place, even of another 

 race. Instances of this may be found recorded in Bard's Com- 

 pendium of Midwifery, N. Y., 1819, pp. 53 and 54, and in the 

 Boston Medical and Surgical Journal, vol. XLI., p. 188. 



In an article on the generation of mammalia and birds, in 

 the London Lancet, vol. i., No. 2, (for 1850, new series,) p. 

 167, it is said 



" Dr. Delfraysse, of Cahors, in France, lately made several 

 experiments on various species of mammalia and birds, regard- 

 ing the influence of the male upon the offspring. He found, 

 by bringing individuals of different species together, that the 

 first coition merely imparts life to the ovum, and that the sub- 

 sequent ones bestow the cclors of the male upon the young ; 

 for, the more coition was repeated, the more likeness did the 

 offspring bear to the parents." These views were submitted 

 to the Academy of Sciences, of Paris. 



If a race is pure that is, if the species or variety is abso- 

 lutely distinct and unsophisticated the progeny resembles 

 the progenitors in almost every respect. The color of the hair, 

 the complexion, habits, general aspect, etc., will be similar. 

 This is exemplified in the North American Indian, the Jews, 

 &c. If, however, a race is made up of mixed blood, as, for 



