REPRODUCTION. 869 



tions in the germinal organization would convert one type into 

 another. 



We find here the question raised, whether sudden alterations of 

 germinal organization may not lie at the base of the origin of new 

 types. 



How much nearer this new theory will bring us to the proper 

 conception of the physiological "phenomenon of life" itself and the 

 "phenomenon of reproduction" of living beings, as a manifestation 

 of the preservation of energy underlying the former, remains to be 

 seen. The solution of the ultimate and most mysterious of all 

 problems the question of the "origin of life" seems to be as remote 

 as ever. 



LITERATURE CONSULTED. 



Heisler's "Embryology." 



Boveri, "Das Problem der Befruchtung," 1902. 



