ACTION OF STRYCHNINE 



223 



or a small loop of the intestine. For the latter record an 

 instrument similar to the one shown in Fig. 212 may be 

 used, or the ointment box kidney oncometer (Fig. 157) 

 may be employed. It is necessary not to get too large a 

 loop of intestine into the oncometer. Three inches of the 

 small intestine bent into a small loop is sufficient. It is 

 very desirable to fasten safety-pins through the ends of 

 the loop as shown in Fig. 212 to prevent more of the in- 

 testine from working into the oncometer after the experi- 



Pin to fasten 

 hop of intestine 



Opening to receive loop 

 of intestine 



Fig. 212. Glass oncometer for a small loop of the intestine. The safety pins 

 should be passed through the edges of the wall of the intestine to prevent more of the 

 intestine from working into the oncometer or any part of the loop from getting out. 

 About three-fourths natural size. 



ment has started. This may also be accomplished by sew- 

 ing a stitch through each end of the loop with a needle and 

 thread and tying the thread in the small holes of the onco- 

 meter. If the gut is allowed to keep crawling more and 

 more into the instrument as the experiment goes on the 

 records will soon be spoiled. When the oncometer is ad- 

 justed then attach the tube for the recording tambour and 

 close the abdomen securely with hemostats or stitches. 



