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p. 42, where a mixture of bread, water, faliva, and 
Ipirit of vitriol effervefced fmartly, before the in- 
tefbne motion j but not at all after it. I could 
obiedt againft thefe experiments, and efpecially the 
5th, that perhaps the proportion of the faliva to the 
acid was too great, and that a perfon in a putrid 
difeafc ought to take more .acids than could be neu- 
tralized by the inquiline liquors. However, I will 
not infift on this ; and fuppofe thefe experiments to 
be quite applicable to the cafe : but if thefe mixtures 
do not effervefee any more, does it follow, '' that 
“ they are neutralized, and therefore adt as acids, by 
faturating any thing of the alcalinous kind, that 
“ they meet with, in their courfe of circulation r” 
There are fome faline bodies, which do not effer- 
vefee when mixed together } which will, however, 
change one another’s nature. Thus J'. e. brimftone, 
mixed with a flrong fixed alcali, does not effer- 
vefee [(?], but changes, on being diffolved, the nature 
of the alcali. A folution of foap does not effervefe 
on the addition of an acid, but joins with the acid, 
and neutralizes it. Thefe inffances made me fuf- 
pedt the conclufion drawn by Dr. M‘Bride from his 
experiments; and to clear up thefe doubts, in this par- 
ticular cafe, I referred to experiments. For this purpofe, 
I mixed, the 4th of Augufl, the thermometer being at 
64®, three ounces of faliva, a dram of the liquor of 
f i] This applies alfo to the folution of brimftone In limewater, 
(HU of which the lime particles have been precipitated, by the 
intodudtion of fixed air. 
putrid 
