V 



^^ 



1 \ 1 - 



FIG. 251. ACTION OF SECRETIN ON THE FLOW OF PANCREATIC JUICE. 



In both tracings, the top line registers the drops of juice falling from a canula in the pancreatic duct. 



The curve below it shows the arterial pressure, with scale in centimetres at the side. 



In the upper tracing, time is shown in minutes below the drop recorder. 



The upper tracing shows the effect of secretin from which the depressor substance had been removed by 



extraction with alcohol in the manner described in the text (page 708). There is no fall in blood 



pressure but a vigorous flow of juice. 

 The lower tracing shows the effect of the depressor substance extracted from the raw secretin. It still 



contained a certain amount of the active secretin. There is a large and prolonged fall of blood 



p-essure, probably due to /3-iminazolylethylamine, but only a small secretory effect. 



lall secretory 



(Launoy et Oechslin, 1913. ] 



709 



