TRANSLATOR S PREFACE. Xlll 



anglaise me permet d'en juger, elle est aussi elegante 

 que fidele. II ne me reste plus qu ; a faire des voeux 

 pour que vos compatriotes jugent mon petit livre 

 aussi favorablement que vous Pavez fait vous-meme. 



Recevez, cher Monsieur, avec mes remerciments 

 reiteres, F expression de mes sentiments les plus dis- 

 tingues. 



A. DE QlJATREFAGES. 

 Monsieur le Dr. H. Lawson. 



To say that the author possesses the highest quali- 

 fications for the task of interpreting developmental 

 phenomena, would be to argue ignorance on the part 

 of the reader and a want of modesty on our own side. 

 We shall therefore leave him to discharge the duty 

 he has taken upon himself. 



We have said our say ; but ere we conclude, we 

 would express our sincere thanks to the Author, 

 Professor Huxley, Dr. Divers, and Messrs. Henry J. 

 Slack and J. Daly, for their kindness in assisting 

 us to examine and correct the proofs, as the following 

 pages travelled through the press. 



H. L. 

 June 20th, 1864. 



