62 Chittenden and Stevmrt — Injhience of several new 



Here, there is noticeable, with the smaller percentages, a slight 

 stimulation of amylolytic action, but it is not sufficiently large to be 

 very marked. 



Paraldehyde. 



This substance shows very strong inhibitory action, even 0*5 percent, 

 diminishing the amount of starch converted by 30 per cent. It must 

 be remembered, however, that the aldehyde is only slightly soluble 

 in water, and that it is more or less volatile. The experiments were 

 conducted in .small flasks and the aldehyde kept more or less emul- 

 sionized with the aqueous solution by shaking the mixtures, but ob- 

 viously the percentages given can only approximately represent the 

 amount actually taking part in the reaction. 



Following are the results of two series of experiments : 



T/i<iIIin Sulphate. 



This salt has a more marked influence on the amylolytic action of 

 saliva than any of the preceding substances. Very small percentages 

 have a noticeable stimulating action, while the presence of 0*2 per 

 cent, of the salt almost entirely stops the action of the ferment. The 

 results of the following two series show one or two small points of 

 diflerence, but in the main they jioint to the same general action. 



