III. OPERATIONS ON THE TRUNK AND 

 GENITAL ORGANS. 



19. PUNCTURE OF THE CHEST. 



Fig. 7. 



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 fluid, dressing material. 



Technic. Operate upon the standing animal, the point 

 of operation in the horse being the seventh intercostal space 

 on the left side, and the sixth on the right. Dogs may be 



Fig. 7. 



Puncture of the chest ; puncture of the intestine. 



laid upon the table. The anterior ribs are so covered by 

 the shoulder that they cannot be counted from before back- 

 wards and must be enumerated from behind forwards. In 

 the horse there are usually eighteen ribs and in the dog 

 fourteen. Counting ii or 12 intercostal spaces from behind 



