NATURAL HISTORY 



O F 



S E 



NTS- 



PART I. 



SECTION I. 



Begin with the Divifion of Serpents, which I diftrl- 

 bate into "Terrejlrial, that Uve upon Land only ; 

 Aquatick, that live in Water; and Amphibious, that 

 inhabit both Elements, Under thefe I comprehend 

 all the Relatives to the venomous Tribe. But how 

 can Land-Serpents live in Water ? I anfwer, their Bodies are 

 equally formed for both Places. 



Among Animals, fome breathe by Lungs, and others by Gills, 

 as all fanguineous Fifh, (excepting the IVbaie.) By GUIs, I mean 

 thofe membranous cartilaginous Parts on both fides the Head, 

 whereby they hear and refpire : What %ve call Gi/!s in Fifn, are 

 properly their Lii?7gs. Refpiration (which is an involuntary Mo- 

 tion of the Breaft, whereby Air is alternately taken in and thrown 

 out) is as neceflary to Fifh as to Land-Animals : In Water, is u 

 great Quantity of Air inclofed, and it is that Air they refpire, and 

 by their Gilis they feparate the Air from the Water, and prefent 

 it to the Blood, after the fame manner as 'tis prefented to the 

 Lungs of Land- Animals. 



B The 



