278 
Chemical Analyses. 
[Sept. 
Spens on the part of the late lamented Bishop of Calcutta, who took every oppor- 
tunity during his visit to the various places of his extensive diocese to bring for- 
ward and encourage objects of commercial, agricultural, and scientific interest. 
The varieties of Coal were chiefly obtained from the cabinets of the Society ; 
unfortunately I was unable to certify the genuineness of some other fragments, 
which should otherwise have been added to the list. 
1. Katkamsandi Hot Spring. 
Specific gravity of the water on arrival in Calcutta 1000.22 ; smell of sulphu- 
retted hydrogen, which disappeared on exposure to the air. 
700,000 grs. evaporated to dryness and redigested in distilled water, left a gritty 
deposit weighing 0.52 grs. which before the blowpipe melted into a yellowish 
glass it rendered borax opaline : and was set down as a mixture of silex, sul- 
phate of lime and oxyde of iron. 
The solution yielded bare traces of sulphuric acid and iron with nitrate of 
silver, a compound precipitate was thrown down of muriate and carbonate : the 
quantities were altogether too small for stricter investigation ; there was no sign of 
magnesia. The contents are therefore carbonic acid, sulphur, silex, alkaline 
muriate and sulphate, and iron. 
2. Get zip ur Kankar. 
Hard nodular : used as a building cement, and for road making. 
Composition — Water of absorption, 14 
Carbonate of lime, 72.0 
Carbonate of magnesia, 0.4 
Silex, 15 2 
Alumine and oxyde of iron, H.O 
100.0 
3. Iron Sand from Rdniganj. 
This seems to be a stalagmitic deposit, or incrustation, of oxyde of iron over 
granitic sand, — resembling in the manner of its formation the kankar , or calcare- 
ous tufa of this country. It may be remarked, that the natives are said always to 
apply the term kankar to this ore, as well as to the nodules of lime kankar; but 
this may perhaps be a corruption of the word khangar , or melted slag of brick- 
earth, to which the ore bears a strong resemblance. The ferruginous matter was 
probably derived, in the shape of a carbonate, from the mineral springs of the vol- 
canic hills in the neighbourhood. 
Composition — Protoxyde of iron, 49 0 
Silex > 37.2 
Alumina, 19 
Water and carbonic acid, 11.2 
Loss, «... 07 
100 
No signs of acid nor of sulphur were discovered on heating red some of the mi- 
neral in a glass tube ; pure water alone was given off. 
4. Graphite from Ceylon. 
The specimen of plumbago brought from Ceylon by the late Bishop of Calcutta, 
? species called Scaly Graphite. Its texture is micaceous, disposed in fiat 
prismatic fibres, which are evidently crystalline, and appear to have an acute 
rnomboidal cleavage 5 but from their flexibility, it is not easy to take any mea- 
