APPENDIX. 
which have come from New Holland; they are, upon the 
whole, like no other that we yet know of ; but as they have 
parts in fome refped fimilar to others, names will naturally 
be given to them expreflive of thofe fimilarities; which has 
already taken place: for inftance, one is called the Kangaroo 
Rat, but which fhould not be called either Kangaroo or 
Rat; I have therefore adopted fuch names as can only be 
appropriated to each particular animal, conveying no 
other idea. 
Animals admit of being divided into great clafies ; but 
will not fo diftindly admit of fubdivifion, without inter- 
fering with each other. Thus the clafs called Quadruped 
is fo well marked, that even the whole is juftly placed 
in the fame clafs. Birds the fame ; Amphibia (as they 
are called) the fame; and fo of fifh, &c. ; but when we are 
fubdividing thefe great clafTes into their different tribes, 
genera, and fpecies, then we find a mixture of properties; 
fome fpecies of one tribe partaking of fimilar properties with 
a fpecies of another tribe. 
Of 
