n6 APPENDIX. 



both hold that new forms are slowly evolved by the force 

 of environment from a few original types, which in time 

 become separate lines of development, the progressives 

 hold that these extremes or terminals are often A entitled to 

 distinct names in science. Connecting forms thrown off at 

 the side of progress and approaching the other forms, are 

 held to indicate relationship not identity. Hence the last- 

 named authors give us lists or descriptions of species with 

 few references to so-called " marked varieties," this prac- 

 tise, the writer thinks, being a distinct gain to science, a 

 welcome reduction of the plague of synonyms, and a pro- 

 nounced help to the learner. J. G. LEMMON. 



& 



JT 



jernmcn . ^L erbanum 



5955 TELEGRAPH AVE. 



Oakland^ (Alden Statto*) 



