UTERINE STRIP CONTRACTIONS 



381 



mine? What conclusions can yon draw? Change the salt 

 solution and then see if you can get a contraction of the 

 strip by adding barium chloride (in one- half per cent solu- 

 tion) to the beaker. On what structures does each of these 

 drugs act? 



Air. vent 



JfOCK 

 solution 



water 

 bath 



Bull dog 

 (Adjustable 

 weight] 



Metal waterbath 



38c. 



Harvard muscle 

 warmer with 

 raduated scale 



in. metal 

 heating rod 

 soldered in 

 wall of 



water bath 



Fig. 316. Arrangement of apparatus for recording contractions of a uterine strip, 

 intestinal strip, or ring, etc. The metal water bath is made of a cheap metal water pail 

 with a heating rod soldered through the side at the bottom. A short metal tube is 

 soldered into a 1-mch opening in the bottom to receive a perforated cork for connecting 

 with the Harvard muscle warmer inside. 



EXPERIMENT CVII. 

 Ergot. (Cat: Action on Uterus.) 



1. Secure a gravid cat as near full term as possible. Un- 

 der the skin of the back inject with a hypodermic syringe 

 two cubic centimeters of a good fluid extract of ergot. Put 

 the animal in a quiet place and observe it carefully from 

 time to time for several hours following. Discuss your con- 

 clusions in detail. 



