PRIMARY FACTORS OF ORGANIC EVOLUTION. 



stages in which the statical conditions of equilibrium 

 of the plasma of the egg is gradually, in a great meas- 

 ure, overriden by the hereditary energies represented 

 by phylogeny and ontogeny. That there still remain 

 traces of the effects of kinetogeny and statogeny in the 

 adult organism cannot be denied in view of the facts 

 to be derived from the shapes of tissue elements, and 

 even of organs, as the foregoing paragraphs show." 



The first appearance of bathmogenetic action is the 

 first modification of the statogenetic and emphytogen- 

 etic energies from whatever source. Changes may be 

 effected in the weight, color, and in functional capacity 

 by temperature, humidity, food, etc., thus exhibiting 

 physiogenesis. Or changes in the size and forms of 

 parts of the body may be produced by movements of 

 the organism, or of its environment, so displaying ki- 

 netogenesis. So long as these modifications of struc- 

 ture should be confined to the individuals thus modi- 

 fied, there would be no evolution. A second genera- 

 tion, if not subjected to the same stimuli, would not 

 possess the modifications ; and their possession of them 

 would depend entirely on the amount of stimulus. In 

 other words, there would be no accumulation of modi- 

 fication. It has, however, been generally believed that 

 these modifications are inherited, and I think it has 

 been shown that this belief rests on a solid basis. Mean- 

 while I have called the bathmogenesis which does not 

 extend beyond the generation in which it appears, 

 autobathmogeny. 



The quantitative relation which necessarily exists 

 between bathmism and its sources may be expressed 

 as follows, with due recognition of the fact that such 

 expression does not rest upon any experimental tests. 

 Emphytogenesis is work done in the construction of 



