No. I.] LARVAL STAGES OF SCHLOENBACHIA. 259 



variation was observed, not only in time, but also in the char- 

 acters themselves, so that one would be inclined to make 

 several species out of one, were it not for the transitions 

 between the varieties. A parallel study of the ontogeny of two 

 nearly related species has shown just these same facts, only in 

 greater degree, for specific variation is only individual variation 

 carried to extremes. 



