[ "2 3 



and the Grebes, foon 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 ftrudlure of heart, neceflary 

 for a long refidence beneath that element." 



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

 form us, that he had diiïeâ:ed many Swallows, but found 

 nothing in them different from other birds as to the organs 

 of refpiration. That all thofe animals which he had dilfed- 

 cd of the clafs that deep during winter, fuch as lizards, frogs, 

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

 thatNall thefe animals, he believes, do breathe in their torpid 

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

 do : and that therefore he efteems it a very wild opinion 

 that terreftrial animals can remain any long time under wa- 

 ter without drowning, 



I fliall here infert a receipt of the manner of 

 making pictures of birds with their natural fea; 

 thers. 



A RECEIPT 



