272 



ILLINOIS STATE ACADEMY OF SCIENCE 



volume. To this add a similar amount of hydrogen perox- 

 ide and if chemic blood is present the solution will turn a 

 distinct blue. 



TYPES OF CURVES 



Curves representing total acidity and free acidity of the 

 periods during complete cycles of digestion have been made. 

 The ordinate of the graph represents the degree of acidity 

 and the abscissa of the graph represents the time periods. 



1. Isosecretory type shows a steady rise, high point 

 usually sustained for half an hour and then a gradual de- 

 cline. The curve is usually steady and unbroken; its high 

 point rounded and not abrupt and is to be found within the 

 neighborhood of one hour. Chart No. 1. 



7t> 

 so 



iO 

 io 



1^ 3* i^ bo 7S ID let 



Chari \.— I soSecretorij ^yp6, Tap line represents toiq) acidilu «i\d 

 louver )ine ires acidify. 



2. Hypersecretory type shows a rapid response to 

 stimuli, rapid increase in acidity, high point from 70 to 

 100 or over, either abrupt or sustained, and a slow decline 

 or none at all in the usual time. It is called the hyper- 

 secretory type because of the general tendency to assume 

 exaggerated proportions. Chart No. 3. 



