SPRINGS-. In T a n n a , we discovered on the fide, o f the harbour towards ther
Volcano, feveral Kot fprings, calledf’by the: natives Dooghos.. The.-,
water came out o f the black ftratum o f fand-ftone mentioned before,
clofe to the edge o f the- fea; . and at. high-water the, wells
were, fometimes covered by the fea..
W e law feveral o f thefe hot fprings-near each other; and, as;
there were little cavities under them,, we cleared them o f the rub-
bilh, and’ after the water had-filled- the-cavities, and overflowed for:
fome time, 8 took my portable thermometer,, with Fahrenheit’s ;
fcale, made by Mr. Ramfden, (which had been, that day , in my.
cabin, a,t y8f- and w h ich , having- been carried clofe to. my body in
a pocket, f found a t 8 of',V and. having placed, it irn the hat well, lo
that the whole bulb and tube were covered,..’the-qnickfilver.^rofe.
foon to 491°, but after haying’been fijc five miniates in. the.well; it:
did not rife.ahove d u*.degree. I. took, the thermometer aut,,and.
cleared the weft Hill hetfot;. and made the excavation o f the ftone
below deeper-, and then, immerfedk- again d-uriag ten minutes, but
found it all the. time at, 19**.. This, was: done Auguft- die! 117th.
1774. at /p -gof- F . M . at high-water. We-returned-: the next
morning about nine o’c lo c k , when the water was low ;. and, upon
immerfing. the ther-mometer as before, wa-oisferved' the q-ukkfilver
to rife to tSy.^ihi the fpoce ofone minute and a half ; a& which, de*
gree it remained, though the, thermometer contipuedifeveral mi*
6 nutes
nutes-longer in the water. I threw feme fmall fiih, and fome sp r in g s ,
mufcks, into the hot water,, and.they were boiled in affew minutes-
The, water is, clear and limpid, and has no-.peculiat fofte, except
that I thought; It to,have a very faint aftringency. I put a piece o f
fine and bright.filver into it,- whichhaving lain for more, than an--
hour in it, came out untarnilhed. I put .a fmall quantity o f folutdon
o f felt o f tartar in it, but it did not precipitate any thing,.
though I inereafed the quantity, of the tartar. I had no other fubftances
with me to try the. water by other methods.
On the feme cliff, but clofe t© die fendy beach, at the bottom o f
the harbour,, there are. two other, hot fprings.. We eame on the
feme morning, Aug. the 18 th ,, half an hour later,, to.'thefe fprings.
i; hollowed out the fand to gather fome o f the hot' water, and im-
merfed my thermometer juft at the pfeee where the water bubbles,
fip, and in. about two-minutes rime the quickfilver rofe to 202»,
and remained for feveral minutes in- the water without riling higher..
On the feme cliff, on a brow, about 60. or 8q fathoms higher, we.
found a place clear o f trees; where in cool weather,, efpeeially after -
rain, we.could difcoyer fe rn the- fh-ip,. fleams rifing, which were
frill more, diftisdtly obferved when-we-came clofe. to the place.. W e .
found oiwfelves, ^ after a few minutes flay; in .a proftrfe perfjjiration,.
accafioned by the hot fteams, and th® heat of the ground we flood*,
on, which in fome places.was- intolerable. When the volcano made
an.;