104 4n ANALYSIS of 
fuggefted to me another mode of making the experiment, whicl: 
fucceeded perfectly in a moderate time. 
Tue foregoing experiments, and others which I made with 
fmall quantities of the water, enabled me to form fome judg- 
ment of the proportion of acid neceflary to faturate the alkali 
which this water contained. I therefore added to 10,000 grains 
of the Rykum water, 200 grains, accurately weighed, of the 
largely diluted vitriolic acid; which quantity I judged to be 
confiderably more than fufficient for faturating the alkali of this 
water ; and after the acid was poured in. the fmall and light 
glafs in which it was weighed, was rinfed feveral times with di- | 
{tilled water, which was added to the Rykum water. I alfo gave | 
ita pale tincture with fome drops of the infufion of litmus, and 
then boiled the water gently in a thin bottomed glafs, until it 
was reduced to one fourth of its firft quantity. it {till conti- 
nued of a red colour, without the leaft tendency to a purplifh 
hue, and fhewed that the acid was more than enough to faturate 
the alkali. 
Ir was neceflary, in the next place, to learn with ‘certainty 
how much of the acid had been fuperfluous. With this inten- 
tion, I added a largely diluted folution of alkali of tartar in di- 
ftilled water. In this folution, the pure alkali, confidered as 
diftiné from the air which was joined to it, conftituted one 
fortieth part of the weight of the fluid. I weighed 38.6 grains 
of this folution ; which quantity I knew, by the previous ex- 
periments, was exactly or nearly fufficient for faturating the fu- 
perfluous acid. I poured it at once into the hot water, and 
rinfing the fmall and light glafs in which it was weighed two 
or three times with diftilled water, I poured in this alfo. A 
little effervefcence appeared in the hot water. I therefore fet it 
again on the furnace to ‘boil, that the fixed air might be éx- 
pelled, and I added now and then a little * diftilled water, to 
prevent it from boiling down too much. In lefs than half an 
hour’s boiling, the fixed air being all expelled, the colour 
: changed. 
