520 



Drs. P. T. Herring and S. Simpson. 



[May 1 ■ 



a slowly moving drum. After a time the tube leading to the dropper was 

 clamped, the bile began to rise in the vertical tube and the height reached 

 was recorded every five minutes, and in some cases every minute. Eeadings 

 were continued for some time after a maximum pressure had been registered. 

 We frequently allowed the bile to flow again at zero pressure, and after 

 a time recorded the rate of secretion again. In some animals several estima- 

 tions of the maximum pressure were made with intervals between of 

 secretion at zero pressure. In a few cases we took simultaneous records of 

 bile and pancreatic pressures ; the latter we intend to deal with in a sub- 

 sequent paper. 



Results Obtained. 



The bile pressure was measured in 19 cats. One of these was unhealthy 

 and suffering from diarrhoea. The maximum bile pressure in this cat was 

 210 mm. bile, and was the lowest of the series. The lowest maximum of 

 the other 18 was 240 mm., and the highest pressure of any we recorded was 

 373 mm. The average maximum pressure for 19 cats was 304*4 mm. bile. 

 The subjoined table gives the figures for each animal. 



Cat. 



Sex. 



Weight. 



Maximum pressure 

 of bile. 







grammes. 



mm. 



A 



Male 



3300 



366 



C 



j) 



2850 



330 



D 



Male (castrated) 



2900 



280 



E 



Female 



2650 



373 



F 



Male 



2600 



310 



G- 



j? 



2950 



335 



H 



Female 



2500 



321 



I 



Male 



3200 



336 



J 



5> 



2750 



282 



L 



Female 



2430 



289 



M 



Male 



3100 



210 



N 



Male (castrated) 



3720 



310 







Female 



2500 



325 



P 



Male 



3200 



315 



Q 



>3 



2850 



319 



R 





3850 



240 



S 



Female 



2600 



272 



T 



5J 



2900 



244 



U 



" 



2300 



327 



Measurements of bile pressure were made in eight dogs. The lowest 

 maximum recorded was 243 mm. bile ; the highest was 342 mm., figures 

 considerably in excess of those given by Heidenhain. The lowness of the. 

 readings obtained by Heidenhain in the dog may possibly be due to his 

 having employed curari. The average pressure in the eight dogs we 



