C *s ] 
Of the fulphureous Mineral Water of Fairburn. 
Dr. Mackenzy in his letter mentioned no more of 
this than that he believed it to be a weaker water, 
of the fame nature as the Caftle-Loed. 
I fubje&edit to the fame tryals, as it: on opening 
the bottles, it emitted a ftrong fulphureous fmell, 
tinged filver, and produced nearly the fame ap- 
pearances as the Caftle-Loed when mixed with the 
fame fubftances, only it remained clear when a fo- 
liition of the true fofiil alkali was mixed with 
it ; the cauftic vegetable alkali occaftoned a very 
fmall light, darkifh cloud, and precipitated but a 
very fmall quantity of a very light fediment, ow- 
ing, as appeared afterwards, to this water containing 
an abforbent or calcarious earth, which probably 
was fufpended by air, and but very little if any 
felenite. 
I evaporated lib. viii. drachm, i. fcrup. i. (or 128 
ounces, four fcruples) of this water with a flow fire. 
When it was evaporated to one half, it was filtrated 
through paper; which operation was repeated again, 
when reduced to three ounces ; after which the re- 
mainder was evaporated to drynefs, and the folid 
matter left, thrown into diftilled water, filtrated 
again through paper, and evaporated to a pellicle, 
and fet in a cool place for the falts to cryftallife. 
By thefe operations, I obtained near gr. ii. of a 
dark coloured light earth, which effervefced with 
acids, and diflolved ; gr. xv. of a white calcarious earth, 
which effervefced with and diflolved in the vitriolic 
acid ; — and gr. xxiv. of Glauber fafts mixed with a 
Vql. LXII. E yellow 
