260 FIRST PRINCIPLES OF NATURAL CLASSIFICATION. 
ease, or climb trees with singular facility. These fa- 
culties, nevertheless, are never found in the same in- 
dividuals ; but are distributed on the same principle as 
that illustrated by the instance of the horse and the ox. 
This is manifestly the case in the rasorial order of birds, 
and the Scansores, or rasorial tribe of the perchers. The 
first never climb, but seem to delight in dry soils ; they 
never perch upon trees but to roost: whilst the Scan- 
sores, comprehending the parrots and woodpeckers, re- 
verse the picture, and show us the climbing property 
of the type in its greatest perfection. The same dis- 
position is observed among the rasorial groups of qua- 
drupeds. The habits of the ruminants are those of the 
gallinaceous order of birds, while those of the sloths are 
precisely similar to the climbing habits of the wood- 
peckers. The food, in conformity to their dispositions, 
is almost always vegetable. The peaceful order of 
ungulated quadrupeds seek their food from the vegetable 
world, and the parrots live entirely upon fruits. This 
is, again, one of the strong points of opposition between 
this and the last type; for natatorial groups are almost 
always purely carnivorous ; and it is only among such 
forms as serve to connect the two, that we find species 
that live both upon animals and vegetables : the trogons 
( T'rogonid@) and the toucans (Ramphastid@) are striking 
examples of this union of different foods. 
(519.) But what more especially distinguishes the 
type we are now describing, is the superior degree of 
intelligence and doceility that runs through all the 
croups of vertebrated animals belonging to it. It seems 
to have been ordained, by Atmiguty Wispom, that there 
should be one type, above all others, whose powers were 
to be more especially devoted to MAn, and which should 
evince an aptitude and a disposition to submit to his 
dominion, far above all other created things. This is 
the grand characteristic of all rasorial types among the 
more perfectly formed vertebrated animals, whose size 
or structure are in any way adapted to answer the end 
proposed. This principle of nature was partially per- 
