STUDYING STAGES OF DEVELOPMENT. 



80 



suits may be expected, the chief preparation for which has already been 

 done. As to the further progress of the laboratory, Mr. Agassiz says the 

 chief field will naturally be the study of the youth of marine animals — 

 not simply of their embryology, but of the successive phases presented in 

 the development of their infant growth, and the relations these bear to 

 adult forms and to general questions of biology and classification. 



MATERIALS FOR LABORATORY STUDY. 



