RECORDING UTERINE CONTRACTIONS 



365 



stats. The tube is held in a large clamp attached to a stand. 

 The thread is brought upward over a very sensitive pulley 

 (one with jeweled bearings is preferred) about one inch in 

 diameter and thence is directed toward the drum where it 

 passes over another pulley and is then connected to a frog 

 heart lever which records the contractions. 



Fig. 307. Tracing showing the action of barium chloride on the uterus, blood-pressure 

 and respiration in a dog. Tracing obtained by Barbour's method. 



The injecting burettes contain adrenaline, ergamine and 

 ergotoxine phosphate. Ergotox'me phosphate is sold by 

 Burroughs, Wellcome & Co., New York and London. It is a 

 line brown powder (one gram vials, $7.00 or $8.00 ench) in- 



