no The Third and Fourth Generation 



and that there is a continuous stream of germ 

 plasm going from parent to offspring, generation 

 after generation, and that this is more or less 

 independent of the body plasm. It is then easy 

 to see why offspring are like their parents; 

 both are produced from the same stuff, the 

 germ plasm. 



To see whether or no the body plasm would 

 affect the germ plasm contained in it, this 

 experiment was tried. The ovaries of a black 

 guinea-pig were transplanted to a white pig 

 after the ovaries of the latter animal had been 

 removed. When the wounds had healed, and 

 the animal had recovered perfectly, this white 

 female with ovaries from a black was mated to a 

 white male. Now we know that the offspring 

 should be all white animals, under normal 

 conditions, when two whites are thus mated. 

 If the white female had affected the germ plasm 

 in the transplanted ovaries, something of the 

 same result would be achieved. As a matter of 

 fact, all the young born were black, with no 

 intimation of white, which is the result that 

 would foUow from mating a black female to 



