UTERINE STRIP RECORDS 



ooo 

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thetized or its head may be instantly cut off with a hatchet 

 or sharp hand ax. The animal may be anesthetized with 

 nitrous oxide (see Experiment VII) if it can be killed in a 

 few seconds after it is removed from the large bottle. 

 Ethyl chloride may also be used instead of ether. 



As soon as the uterine strip is adjusted in the beaker, 

 warm (38) normal salt solution (or Locke's solution, etc.) 



Q/ass 

 tube- 



ormal salt sol. 37'c 

 Uterus strip ^ 



Removable beaker 



Fig. 292. Arrangement of apparatus for recording contractions from a uterine strip, or 

 from an arterial ring, ureter ring, intestinal strip, ring of frog's stomach, etc. 



is placed in the beaker. The writing point of the lever is 

 brought on to the drum which is started at the slowest 

 speed. Small rhythmic contractions should be recorded. 

 When sufficient normal records have been taken (there are 

 great variations in the normal contractions exhibited by 

 different uteri) then with a pipette pour one or two (or 

 more) cubic centimeters of a solution of lobeline (one 

 cubic centimeter equals one milligram) into the beaker. 



