This is the introduction of physiologic saline solution into the subcutaneous cellular tissue. Although it is not possible to introduce it quite as rapidly as by the intravenous method, the saving of the time required to find a vein, isolate it, and insert the canula, will at times make this the method of choice. The same apparatus is needed as described in transfusion, except in the place of the canula should be used a large hollow needle. This should be pushed well into the subcutaneous cellular tissue, and the pressure will need to be a little greater than for transfusion, five feet elevation as an average.
The skin should l)e carefully cleaned before introducing the needle, which should be inserted while the solution is flowing from it. The best place, in the female, is the submammary region, where a pint or more may be easily introduced on either side. Next in the order of choice is the subaxillary region. Excepting the submammary region in the female, not more than a pint should be introduced at any one place. If more is desired, re-introduce the needle elsewhere.
The slower the fluid is introduced the better, within reasonable limits, and the rate of 500 c. c. in fifteen minutes should never be exceeded. When the needle is with' drawn the puncture should be sealed with a little cotton and collodion, or Adhesive plaster.