III. OPERATIONS ON THE TRUNK AND GENITAL 

 ORGANS. 



20. PUNCTURE OF THE CHEST. 

 Fig. 4. 



Objects. The relief of hydrothorax or pyothorax. 



Instruments. Razor, scissors, trocar, i m. of rubber 

 tubing of the same size as the trocar, vessel for receiving 

 the escaping iiuid, dressing material. 



Technic. Operate upon the standing animal, the point 

 of operation being the seventh intercostal space on the left 

 side, and the sixth on the right. Dogs may be laid upon 



Fig. 4. 

 Puncture of the chest ; puncture of the intestine. 



the table. The anterior ribs are so covered by the shoulder 

 that they cannot be counted from before backwards and 

 must be enumerated from behind forwards. In the horse 

 we estimate eighteen ribs and in the dog fourteen. Count- 

 ing II or 12 intercostal spaces from behind we reach the 



