VI. 



it might b. ' upon as const ;> 



link Ix-tuccii the j.-rojicr or \i\iparous quadrupeds 

 and li/ard--. Tlie Jerboa and the Kangaroo \ 

 the i. des *f birds; generally 



ling on the hind legs only. The Bats may 

 also I" adduced aa quadrupeds of an anomalous 

 nature, and possessed of the power of flight ; 

 while tin Cetaceous tribe affords a striking instance 

 of the gradual declension of the quadruped form, 

 till in the Manati it approaches to that of a very 

 different class of beings. Even among birds then- 

 are not wanting Mime instances of the same sort 

 of indistinct alliance to animals of an opposite 

 cast; the Penguins, v\hich I have just mentioned, 

 hcifiLT furnished with wings so very short, covered 

 with leathers so very small, so much resembling 

 scales, and so perfectly useless for flight, that they 

 seem approximated in some degree to fishes, and 

 are capable of exercising with case and rxp' 

 d it ion no other actions than those of swimming 

 and diving; since when they attempt to walk, 

 they can merely stagger alnnir in an awkward 

 manner, and if di>turhed are liable to stumble and 

 l.ill. 



-remis I\-nt{in i> not very numerous, and 



