ADJUSTMENT OF ONCOMETER 



161 



if other changes occur in the pressure of the cerebrospinal 

 fluid. The anesthesia should be as nearly perfect as pos- 

 sible while the above parts of the experiment are being 

 performed. 



3. With a median longitudinal incision now open the 

 abdomen and place hemostats at each side on the edges of 

 the wound. Pull upward and outward on these (two) hem- 

 ostats and expose the viscera. Do not manipulate these 

 organs any more than you can help or the animal may pass 

 into a condition of shock. Keep Hie Intestines inside the 

 abdomen. If you have a spleen oncometer (Figs. 152 and 

 153) this is easiest for a beginner to adjust. Gently pull 



Fig. 153. Spleen oncometer for dogs. About one-half natural size. 



the spleen forward and fit it into the oncometer, close the 

 instrument and place it back into the abdomen, attach the 

 tube for the tambour and close the abdomen air tight with 

 three or four hemostats. (Sew it up if you do not have 

 hemostats.) The abdominal wound must be closed tightly 

 and there should be no internal hemorrhage. If you have 

 a kidney oncometer (Figs. 154 and 156) instead of one for 

 the spleen, then refer to Fig. 158, and in the manner there 

 shown expose the left kidney. Do not injure the renal ves- 

 sels but gently lift up the kidney and slip it into the on- 

 cometer. Carefully avoid catching loops of the intestines 

 or a piece of the omentum in the oncometer. Close the lid 

 and fasten the latches (or put on the rubber band) and 

 connect the tube for the tambour. Carefully replace the 



