The instrument alluded to in the foregoing paragraph is also employed to introduce medicines into the circulation by injecting suitable solutions of active agents into the loose tissues beneath the skin (fig. 441). The position chosen for the purpose is of no great importance, but safety to the operator and convenience alike suggest the loose folds behind the elbow.

Making a Subcutaneous Injection in the Neck.

Fig. 441. - Making a Subcutaneous Injection in the Neck.

Intra-venous Injection is another method occasionally employed, and consists in injecting medicines directly into one or another of the superficial veins of the body. The vessel most commonly used for this purpose is the jugular vein. The operation, however, is one which should only be performed by the expert veterinarian.