126 THE DIRECT INFLUENCE 



ters. In this case both structural and color char- 

 acters are modified. 



" Many other illustrations might be given of the 

 entire change in the coloration of body, both in larvae 

 or adult, of the modifications of parts and of particular 

 portions of the body or of individual color marks. These 

 arise, some from the treatment of the male germinal ma- 

 terial, some from treatment of the female germinal sub- 

 stance, others from a treatment of both germinal ma- 

 terials to the conditions of experiment. In some of 

 the modifications thus induced, the full expression of 

 the change is attained at once in the individuals that 

 develop from the treated germs, and in others it 

 requires one, two, three or more generations to attain 

 the full expression of the modified attribute. It does 

 not make any difference whether the full development of 

 the modification is attained at once, or after the lapse 

 of several generations, the behavior is the same, in that 

 there is no regression or reversion to the parental con- 

 dition. 



" In my published work I have given some of the 

 results derived from the application of external factors 

 at one stage of the germ cells. Eggs that have been 

 subjected to the conditions of experiment immediately 

 before the maturation period, have given the results 

 now in print and it was from eggs so treated that the 

 race illustrated in this statement came. Analysis of 

 the results from these experiments shows a number of 

 interesting points. 



" First : Not all of the germ-cells are modified, but 

 only a varying proportion of them, which may indicate 

 one of two things; either that there are differences 

 between the eggs in their capacity for modification, or 

 that only certain eggs were in the proper stage for 

 modification, at the time of the application of the experi- 

 mental conditions. Second: The results are sometimes 

 modifications all in one direction, at others they are in 

 many directions, two, three or more different forms 

 arising from the same experiment. Third: The mod- 



