76 



same degree in which such propositions and phrases might 

 have seemed or sounded to you like explanations of the 

 facts : but I should have done no more : you would have 

 had apparent instead of real knowledge. 



No one, as it appears to me, who carefully analyses the 

 language of the Generations-wechsel theory of Professor 

 Steenstrup, will be able to conceal from himself that it con- 

 veys no idea leading, even by a single step, to a closer 

 knowledge of the essential conditions of the development 

 of an Aphis in the body of a virgin parent. But all will 

 readily concede to him the merit of the assemblage of the 

 phaenomena from scattered memoirs into one convenient 

 work, and gratefully award to the ingenious author the 

 praise due for this useful labour, as well as for the confir- 

 mation of some of the facts and the addition of others, which 

 yet must have remained as unexplained and empirical phae- 

 nomena, until the organic conditions had been pointed out 

 which are essential to the * Lucina sine concubitu.' 



END. 



Printed by RICHARD and JOHN E, TAYLOR, Red Lion Court, Fleet Street. 



