a NA, CF GE BS 
OF 
DIFFERENT CLASSES 
OF 
ORGANIZED BEINGS. 
oe 
CLASSIFIED lists of animals and plants express, 
or ought to express, and exhibit the prominent dif- 
ferential character of each order or genus, that pe- 
culiar mark in which all species and individuals, in- 
cluded in each division, agree among themselves; 
and by which they are readily to be distinguished 
from all those species of other divisions which do not 
possess such mark or character. It were assuredly 
desirable that every generic name should be adapted 
to suggest the characteristic mark by which the di- 
vision is to be defined; as Mammalia rather than 
Fere. The best arrangements are those which ex- 
hibit the best selection of such characters. But 
genera and species possessing these characters of dis- 
similitude, however wide and striking, may possess 
analogical agreement amongst themselves scarcely 
less clear, and at least equally deserving our at- 
tention. . 
** Some animals,” says the father of zoology and 
B 
