70 ON HEKEDITY. 



an exhaustive treatment of the subject could be given. I have also 

 abstained from giving- further details in the form of an appendix, 

 chiefly because I could hardly have attempted to complete a treat- 

 ment of the whole range of the subject, and I hope to refer 

 again to these questions in the future, when new experiments and 

 observations have been made. 



I am very glad to see that such an important authority as 

 Pfliiger 1 has in the meantime come to the same opinion, from an 

 entirely different direction an opinion which forms the founda- 

 tion of the views here brought forward, namely, that heredity 

 depends upon the continuity of the molecular substance of the 

 germ from generation to generation. 



A. W. 



1 Pfliiger, ' Ueber den Einfluss der Schwerkraft auf die Theilung der Zellen und 

 auf die Entwicklung des Embryo,' Arch. f. Physiol. Bd. XXXII. p. 68, 1883. 



