KINDS OF PARENTS 71 



the race by the sperm cell and the male parent, are so 

 different from that rendered by the egg and the female, 

 that the very doing of the necessary work of the two 

 sexes results in differences, just as the farmer becomes 

 different from the banker or teacher by giving his time 

 and thought to different things. 



We have seen that the egg cell is large, passive, and 

 highly nourished, while the male cell is minute, poorly 

 nourished, and exceedingly active. When these gametes 

 unite, it is the egg that attracts, while it remains passive, 

 and it is the male cell that is aroused by the presence of 

 the egg and actively seeks out the female cell and unites 

 with it. The role or function of the two cells is different. 

 It is inevitable that the parent that produces eggs, if it is 

 to do its proper motherly work, will become modified in 

 nature and instincts and in structure by producing the 

 eggs and bringing them to the proper condition for 

 fertilization. Similarly, the structures and the instincts 

 demanded of the parent that is to produce sperms will 

 be very different from those of the mother. 



We can thus see that certain internal forces are at work 

 making male parents and female parents different, and 

 that there are duties and tasks suitable to each, so different 

 from the other, that the internal differences will be used 

 and increased by use. 



