350 Si H. Scudder— Canons of Nomenclature. 
differed from preceding ones in his ideas of the precise limite 
tion of any group in question. This indeed has already been 
this limitation should itself be subject to one exception, which 
may be formulated thus : 
6. But any assemblage so defined by an author as harshly 
to violate the groupings of nature (as known to naturalists of — 
his time), should be cancelled. 
uch a rule would prevent the injury which might acerue to 
science by too close an application of the preceding law. 
parenthetical limitation seems, however, to be necessary. 
I anges in the name of one group should not affect the 
names of other groups. 
s. Mo 
To this canon no exception whatever should be made or 
consent. Anyone who considers the subject, will see yo : 
apparently reasonable exception will lead to another 
less desirable, until the whole value and force of the Pp 
canon is destroyed. known, 35 
II e mere enumeration of its members, when ENO". 
a sufficient definition of the limits of a group, and gives 
unquestionable claim to recognition. 
epee ; 2 , ery name pro 
Ithough it is certainly most desirable that ev yd (ot shortly 
essential ¢ eo 
