*26- ne Wis-Dou of GOD Parti. 



them, as two Sorts of Fifhes, one Sort of Lizard, 

 and the Batt , not to mention the numerous 

 Tribes of flying Infeds. In like Manner, tho' 

 the Air-bladder in Fiflies feems neceffary for 

 fwimming, yet fome are fo form'd as to fwim 

 without it, viz, Firft, the Cartilagineous Kind, 

 which by what Artifice they poize themfelves, 

 afcend and defcend at Pleafure, and continue in 

 what Depth of Water they lift, is as yet un- 

 known to us. Secondly the Cetaceous Kind, or 

 Sea-beafts, differing in nothing almoft from Qua- 

 drupeds but the Want of Feet. The Air which 

 in Refpiration thefe receive into their Lungs, 

 may ferve to render their Bodies equiponderant 

 to the Water; and the Conftridtion or Dilata- 

 tion of it, by the Help of the Diaphragm and 

 Mufcles of Refpiration, may probably affift them 

 to afcend or defcend in the Water, by a light 

 Impulfe thereof with their Fins. 



Again, Tho' the Water being a cold Ele- 

 ment, the moft wife God hath fo attemper'd the 

 Blood and Bodies of Fifhes in general, that a 

 fmall Degree of Heat is fufficient to preferve their 

 due Confiftency and Motion, and to maintain 

 Life; yet to (hew that he can preferve a Crea- 

 ture in the Sea, and in the coldeft Part of the 

 Sea too, that may have as great a Degree of Heat 

 as Quadrupeds themfelves, he hath created Va- 

 riety of thefe cetaceous Fiflies, which converfe 

 chiefly in the Northern Seas, whofe whole Bo- 

 dy being incompafs^d round with a copious Fat 

 or Blubber ( which, by reflecting and redoub- 

 ling the internal Heat, and keeping oflfthe exter- 

 nal 



