258 



BOYINB PATHOLOGY. 



Puncture the Rumen as a preliminary and palliative 

 measure. It must be clearly understood that this depar- 

 ture from the rule, " Remove the cause and the effect will 



Fig. 51. — The seat of puncture of the rumen (a). 



cease," is only an expedient for gaining time for further 

 measures. 



PiQ. 52.— Trocar and Canula. 



The instrument used is the trocar and canula, which 

 is large, about eight inches long and nearly half an 

 inch in diameter. The puncture should be made on the 

 left side, at a point equally distant from the point of the 

 hip, the last rib, and the lumbar transverse processes (see 

 Fig. 51) . The tube is then opened by removal of the trocar ; 

 the canula may be left in as long as required, and retained 

 by string. Sometimes the rush of gas suddenly ceases 

 before much has escaped; this is due to solid matter having 

 accumulated round the end of the canula. This must be 

 removed by insertion of a probe or movement of the 

 canula. The length of the tube allows for a certain 

 amount of collapse of the rumen after puncture. " Suck- 

 ing calves are occasionally subject to hoove. Little more 



