224 



Dr. J. T. Cash. 



0'. Sound introduced ; pendulum movements for first minute. 



1'. j, advanced 7 mm. 



2'. „ „ 25 „ 



3'. Movement of all intestine. 



4'. Sound advanced 60 mm. The propulsion of the sound greatly- 

 accelerated. 



5'. Contractions eleven to the minute ; relaxation between. Waves 



very imperfect. 

 6'. Sound advanced 111 mm. 



6' 30". Sound advanced 142 mm. ~No marked pause takes place in 

 the occurrence of the waves. A maximum rapidity of 38 mm, 

 in the minute is attained towards the end of the curve. 



Contrasting this result with Observation III gives the relative 

 speed of the progressive peristalsis in the two cases. 



Time after introduction 

 of sound in minutes. 



Sound travels 



Before food (hunger). 



15 minutes after food. 





cm. 



cm. 



2 



5 3 



2-5 





The progressive peri- 







stalsis stimulated by 







introduction of sound. 





4 



0-2 



3 5 



6 



0-4 



5-1 



7 





3-1 



8 



0-8 





Experiment VII, Curve VI. — See Chart VI. 



Reduced scale = T \ths. 



