C tI2 ] 



and the Grebes, {bon perifh, if caught under ice^ 

 or entangled in nets : and it is well known, that 

 thofe animals will continue much longer under 

 water than any others to whom nature hath de- 

 nied that particular ftruflure of heart, necelTary 

 for a long refidence beneath that element." 



anatomift, Mr. John Hunter ; who was fo obliging to in- 

 form us, that he had difTedted many Swallows, but found 

 nothing in them différent from other birds as to the organs 

 of refpiration. That all thofe animals which he had diffed:^ 

 ed of the clafs that fleep during winter, fuch as lizards, ft-ogs, 

 &c. had a very different conformation as to thofe organs : 

 that all thefe animals, he believes, do breathe in their torpid 

 ftate ; and, as far as his experience reaches, he knows they 

 4I0 : and that therefore he efteems it a very wild opinion 

 that terreftrial animals can remain any long time under wa- 

 ter without drowning. 



I fhall here infert a receipt of the manner of 

 making pidtures of birds with their natural fea- 

 thers. 



A RECEIPT 



