440 PRIMARY FACTORS OF ORGANIC EVOLUTION 



Lepidoptera "by several English entomologists. By 

 exposure to different colors, of larvae which were ap- 

 proaching the period of pupation, corresponding colors 

 were produced in the pupae. Thus black, dark, green, 

 and yellow larvae, and larvae with gilt spots or entirely^ 

 gilded, were produced at will. In this instance the 

 dynamic effect produced by the exposure was stored 

 for the period which elapsed between the exposure of 

 the larva and the full development of the pupa. In 

 another experiment, larvae which were in the act of 

 weaving cocoons, on exposure to certain colors, were 

 induced to weave cocoons of corresponding color. 

 This experiment demonstrates that a stimulus may be 

 transmitted to a gland so as to modify the character 

 of its secretion in a new direction. From both experi- 

 ments we learn the transmissibility of energy from the 

 point of stimulus to a remote region of the body, and 

 its conversion into growth energy (in this case by 

 Physiogenesis). This prepares us to look upon hered- 

 ity as an allied phenomenon, i. e., the transmission of 

 a special energy from a point of stimulus to the germ- 

 cells, and its composition there with the emphytogenic 

 (inherited) energy into bathmism (or evolutionary en- 

 ergy)- 



The relation of inherited and acquired characters 

 in a series of generations may be graphically repre- 

 sented as follows : Let represent the aggregate of 

 character of the body (soma~} of a given species in pro- 

 cess of progressive evolution or acceleration. Let g 

 represent the aggregate of characters potential (or dy- 

 namically present) in the germ cells of the same indi- 

 vidual. For the sake of simplification of the problem 

 I consider here only one sex, and imagine the repro- 

 duction to be parthenogenetic. Let A represent the 



