220 



Dr. J. T. Cash. 



1'. Active propelling peristalsis; sound has travelled 2 cm. into 

 intestine. 



2'. Continnation of active peristalsis ; sound advanced in all 

 5' 2 cm. (At this time effect due to the introduction of sound 

 passes off, and advancement occurs more slowly; local non- 

 propulsive movements taking place from time to time.) 



8'. Has advanced in all 7'4 cm. 

 14'. Has advanced in all 8*2 cm. 



18'. Advancement has been slow; is now 10 cm. from upper open- 

 ing of gut. At this point contraction becomes more active. 

 25'. 12*8 cm. traversed ; peristalsis succeeded by a pause. 

 29'. 12'9 cm. ; pause in contractions. 



35'. 16 - 2 cm.; active propulsive peristalsis reappeared. Capsule 

 expelled from lower fistulous opening. 



The total time occupied in the passage of the sound through 

 16*2 pm. of fistulous intestine was 35'. 



Effect of Feeding. — I will now turn to the effect produced upon the 

 fastiug intestine by the introduction of food into the stomach. The 

 method of experimentation will be at once apparent. 



A fixed or travelling sound was introduced through the fistula, and 

 the condition of the fasting intestine, as regards its movement, was 

 recorded. At a noted time the dog, whose head had been kept covered 

 with a cloth, had a series of pieces of meat given to it which it rapidly 

 swallowed without changing its position on the table. (The covering 

 of the head was a necessary precaution which I adopted in almost all 

 the observations in order that this experimental procedure should not 

 be associated in the mind of the animal with the administration of 

 food only ; for if the dog saw meat when in a condition of hunger, or 

 had its proximity suggested in any way, it was sufficient to produce 

 an active though frequently transitory contraction in the fistulous 

 gut.) 



The notes of the following experiment which was made when the 

 animal was showing unmistakeable indications of hunger, will illus- 

 trate the modification in an already existing peristalsis on the intro- 

 duction of food into the stomach. 



Experiment IV (Curve III). — 



0'. Introduction of large sound, used in the previous experiment. 

 1'. Active peristalsis has commenced. 



3'. Propulsive movements alternate with local or non-propulsive. 

 5'. The animal was somewhat excited by the movement of a plate 



on to the table on which it was lying. 

 7*5'. About 50 grams of meat were presented to the dog in pieces 



and rapidly swallowed. 

 10'. Intestine quiet, except for faint local movements around the 



sound. 



