S8 INTKA I 'ENO US IXJECTIOX. 



14. INTRA-TRACHEAL IRRIGATION. 



Objects. The washing out of oils or other insoluble or 

 irritant substances accidentally introduced into the trachea 

 and bronchi while drenching or otherwise, and the disin- 

 fection of the trachea and bronchi. 



Instruments. Same as for tracheotomy, and a gravity 

 irrigating apparatus fitted with 3 m. of rubber tubing about 

 I cm. in diameter, 5 liters of .6 per cent, sodium chloride 

 solution at a temperature of 37 to 39° C. In cases of 

 suppurative bronchitis, peroxide of hydrogen may be added 

 to the solution. 



Technic. Operate on the standing animal. Perform 

 tracheotomy (page 76). Elevate the gravity apparatus 

 containing the irrigating fluid i to 2 m. above the patient, 

 have the animal's head slightly elevated, insert the free end 

 of the rubber hose in the trachea tube and let the fluid flow 

 into the trachea in a moderate stream until it is filled and 

 the animal makes expulsive efforts, when the inflow is 

 stopped and the animal permitted to lower his head and 

 expel the fluid, then raise the head again and repeat until 

 the fluid is expelled clear. Repeat the operation according 

 to requirement. 



15. INTRAVENOUS INJECTION. 



Fig. 6. 



Instruments. Scissors, hypodermic syringe. 



Technic. The operation is performed on the standing 

 animal on either jugular vein at about the juncture of the 

 upper and middle thirds of the neck ; to most operators the 

 right jugular is the more convenient. At the place desig- 

 nated the subscapulo-hyoideus muscle lies between the 

 jugular vein and the carotid artery and affords some pro- 

 tection against injury of the latter. After clipping the hair, 



