62. Obfervations on the pulmo arli- 

 trarius enjoyed by them. 



63. General remarks on the ftru6hire 

 offerpents. 



64. Of the teeth of ferpents, and 

 their canal for the paffage of the 

 poifonous fluid* 



Of the refervoir in which this 

 fluid is contained. 



65. Of the general effels of wounds 

 made by the teeth of venomous 

 ferpents. 



66. Obfervations on the treatment of 

 perfons bit by this fpecies of ani- 

 mals. 



OF FISHES. 



67. Remarks on the ftrufture and 

 ufe of the fins, tail, and other ex- 

 ternal parts. 



68. Of the fituation, and ftrufture of 

 the teeth of fifties; 



M 2 69, Of 



