more universally known and long established, altho' per- 
haps unnecessarily narrow genera, into one, such an ad- 
vantage even in a natural method as repays the inconve- 
nience which infallibly accompanies innovation? In the most 
naturaÌ system, genera, as well as larger divisions of aìl de- 
nominations, are mere devices in aid of science; and have 
no other standard of limitation than the general assent ac- 
corded to the experience of their use in the management 
of a collective mass, unwieldy for the purposes of know- 
ledge without them. Nor can any other divisions be formed  . 
when we admit a creatión of distinct species confining 
throughout by equable transitions. 
