Scientific Proceedings. 



(125) 61 



to a mammalian temperature shows a course of fatigue similar to 

 that of mammalian muscle, and on the other hand, that a warm- 

 blooded muscle on being cooled, fatigues like the muscles of cold- 

 blooded animals at a similar temperature. From the supposed 

 effects he concludes that in the matter of fatigue there is no real 

 physiological difference between the two groups of muscle. 



The author has investigated the question by very careful meth- 

 ods in a considerable variety of animals, and has not been able to 

 confirm Lohmann's conclusions. The muscles of the frog and the 

 turtle show their characteristic method of fatigue whatever the 

 temperature. The muscles of warm-blooded animals on being 

 cooled and then fatigued, show either no slowing of the contrac- 

 tion process or only a slight slowing. The latter seems to be 

 most pronounced in the rodents, namely, the rabbit, the mouse 

 and the rat. [See page 37 (101).] 



28 (74). " On intraureteral pressure and its relation to the 

 peristaltic movements of the ureter," with demonstrations : 

 DANIEL R. LUCAS. (By invitation.) 



By means of a cannula placed in the ureter and retained with- 

 out ligatures, and which did not materially interfere with the 

 peristalsis of the ureter, the intraureteral pressure and its relation 

 to the peristaltic movements of the ureter were ascertained. 



In nine experiments on dogs narcotized with morphin and 

 atropin, the pressure in the ureter arose only to a minute degree, 

 the average being a negative pressure, more pronounced under the 

 influence of diuretics. In five, in which chloroform was used, the 

 pressure was always positive ; the irritability and contractility of 

 the ureter were noticeably diminished. In six, under ether, the 

 ureter was noted to be irritable and contractile three hours after the 

 anesthesia was commenced ; the pressure was low. In four, in 

 which ether followed the administration of chloroform, ether showed 

 a stimulating effect on the peristalsis, running the pressure rapidly 

 down. In three, in which morphin and atropin, chloroform, and 

 ether were successively tried during the same experiment, the 

 specific effect of each as above noted was again observed. In an 

 animal in which anesthesia was produced by decerebration, irri- 

 tability and contractility of the ureter muscle were noted ; the pres- 

 sure was low, tending to negative on stimulating the ureter distal 



