PROCEEDINGS OF SECTION B. 393 
qualitative analysis showed the presence of hydrochloric, sulphuric, 
and sulphydric acids, together with silica, the metals iron, 
aluminium, calcium, magnesium, and sodium, and ferrous sulphide, 
as already mentioned. 
As far as can be ascertained from the above necessarily 
imperfect examination, there is nothing unusual in the character 
of the water; the spectroscope did not show the presence of any 
of the rarer alkaline metals, such as lithium. A much larger 
quantity of the water would be required to make a satisfactory 
examination for them, but there was quite sufficient of the water 
to show that they are not present in any quantity. 
The following notes are appended, as it may be of interest to 
some of the members to have the accounts of other Pacific hot 
spring waters for comparison. * 
Samples of Water from the Islands of Simbo and Santa Anna. 
Collected by Dr. H. B. Guppy, Surgeon H.M.S. “Zaz.” 
Bottle 49.—Containing water from the fresh-water lake of 
Wailava, in the island of Santa Anna, collected in April, 1882. 
I have seen no reference to this lake in any of the works which 
bear on these islands. The island of Santa Anna has the 
characters of a raised atoll, with the large central depression 
occupied at its lowest part by the waters of the lakes of Wailava 
and Waipiapia. Wailava is about half-a-mile across in length, 
and has a depth of 15 fathoms, as ascertained by Lieut. Oldham. 
On carefully examining this lake, I found that its waters are at 
about the sea level, though they are not affected by the rise and 
fall of the tides. On one side it is only separated from the sea 
by a low swampy tract about one-third of a mile across, and not 
elevated more than 20 feet above the sea. The surface of this 
tract is strewn with coral fragments, 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. On making 
a rough examination, I found the density about that of fresh 
water, with chlorides abundant, me two or three grains per 
gallon, ammonia unmistakeable, fas¢e flat andfresh. The water 
rapidly decolourises 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 up to the highest summit, 
about 1100 feet above the sea. This water was collected from 
* Journal of the Koy. Soc. of N.S.W. for 1887, vol. xi p. 223. 
