284 BIOLOGICAL LECTURES. 



The pronounced " epigenesist " of to-day who postulates 

 little or no predetermination in the germ must gird himself to 

 perform Herculean labors in explaining how the complex 

 heterogeneity of the adult organism can arise from chemical 

 enzymes, 1 while the pronounced " preformationist " of to-day 

 is bound to elucidate the elaborate morphological structure 

 which he insists must be present in the germ. Both tenden- 

 cies will find their correctives in investigation. 



1 See, e.g., Loeb, J., "Assimilation and Heredity," Monist, July, 1898, p. 555. 



