PROCEEDINGS, 225 
agments, and the more swampy portion abounds with Auricule. 
It is evident that this lake has been only cut off from the sea by 
recent elevation. 
making a rough examination, I found the density about 
that of fresh water, with chlorides abundant, lime two or three 
grains per gallon, ammonia unmistakeable, taste flat and fresh : 
rapidly decolourizes a solution of permanganate of potash. 
Bottles 142 and 143, containing water from the boiling spring 
in the island of Simbo, collected in May, 1882. The island of 
Simbo is formed of trachytic rocks, and contains in the southern 
part an extinct crater, a solfatara, and numerous fumaroles which 
pierce the rocks, occurring from the sea-level up to the highest 
summit about 1,100 feet above the sea. This water was collected 
from the boiling-spring on the shores of a lagoon (very probably 
a aa bg A eee ee 
water, with the tidal movements of which its waters rise and fall, 
Tam of opinion from a cursory examination of the water that its 
_ Composition may be regarded as sea-water,, plus the eee 
discharged by a fumarole. . 
Bottle 150. Water condensed from one of the fumaroles in the 
Solfatara, on the soutli-west point of Simbo, in May, 1882. A vecase 
sulphur, which unavoidably fell in, forms a sediment at the bo — 
_ ofthe bottle. For two hours the thermometer retained in the 
| : ° and 210° F. 
volved, flaky crystals of sulphur encrusting the sides of the 
a 
with silver nitrate, whilst the presence of sulphurous acid appeared 
0 be indicated by the suffocating smell of burning sulphur, by the 
: Presence of sulphur deposits, and by the reddening of litmus paper. 
ie: turbidity was produced in lime-water, nor was the : 
‘Yarochloric acid gas shown on exposing 2 solution of silver 
‘trate, The interior of the solfatara was yee by the decom- 
volved. 
avole in question was rather under 300 feet above the sea. 
Soils 151. , 1882, from one of the 
tmaroles on the summit of the South Hill in the island of Simbo, 
Clevated about 1,100 above the sea. The temperature of the 
8 
