1850.] On Calderite, a new Rock from Burdwan. 145 



near Moulmein,* and I have also detected iron in this peculiar state in 

 a common, but highly efficacious preparation, the decoction of Chiretta, 

 which if administered with regularity with a little of the Elixir of 

 Vitriol added to it, is almost of sovereign efficacy against those enlarge- 

 ments of the spleen, which both in Natives and Europeans so constantly 

 follow or accompany intermittent fevers, especially in children. 



Now when a portion of the Sikkim soil is agitated with water, and 

 being allowed to stand for 24 hours is tested by Tincture of Galls, 

 nothing is shewn ; but upon adding lime water, the purple or rather 

 greenish black tinge forthwith appears. The same takes place with 

 yellow-ochre, but upon trying it with the officinal carbonate of iron it 

 is not produced. My specimen of this last was not freshly prepared, 

 so that this is not quite a certain result ; but it must be also very rarely 

 furnished in the fresh state from the shops. The physicians must now, 

 if yellow-ochre be not too insignificant a remedy, pursue Dr. Campbell's 

 discovery with this commentary, the part of the chemist closing here. 



On Cal1>erite, anundescribed Siliceo-Iron-and-Manganese Rock, from 

 the district of Burdwan. By Henry PiDdtngton, Curator Museum 

 Economic Geology. 



I had found and put by for examination a specimen of this rock, 

 which I at first took to be simply an ore of Iron and Manganese, from 

 one of our old collections ; being the series from the Ramghur district, 

 (presented, I think, by the Rev. Mr. Everest ?) this specimen being 

 from Kut-Kumsandy 12 miles N. W. of Hazareebagh. Dr. McClelland, 

 who had also been struck by its appearance, brought me a specimen 

 from the collections of the Survey. I also found several in the late 

 Mr. William's iron ores, one being a very fine block from Rurdwanf in 

 which district it seems not to be uncommon. I shall presently state 

 why I have styled it a rock and not an ore. 



* Examination and analysis of a mineral water from the Athan Hills in the 

 Tenasserim Provinces. Gleanings of Science for 18.31 , Vol. III. p. 25 : — read before 

 the Physical Class, As. Soc. 



t Proceedings, Nov. 1848= 



V 



