Intelligeme and Miscellaneous Artftlei. 465 



cliloric acid with heat, but it is not thus possible to obtain a 

 complete analysis. The mineral is found at Bolton, Mass., 

 in a white cleavable limestone with black augite. Having a 

 good specimen, I requested Mr. Ludwig Stadtmuller, one of 

 our pupils, to undertake the analyais. The following are the 

 results confirmed by several trials; the alkaline constituents 

 being determined by fusion with carbonate of baryta. ^^ 



100-281 



It is obvious from simple inspection, that this analysis cor- 

 responds exactly with scapolite, and we have no hesitation in 

 referring Nuttallite to scapolite. 



LVII. Litelligence and Miscellaneous Articles. 'o% 



oil 



ON THE STATE IN WHICH ARSENIC EXISTS IN THE DEPOSIT 

 FROM MINERAL WATERS. BY M. J. L. LASSAIGNE. 



SINCE the discovery of the presence of arsenic in the deposits from 

 certain chalybeate mineral waters, it has been asked whether 

 the poisonous properties of this substance are not neutralized by the 

 state in which it is found. No experiment having been yet under- 

 taken on this subject, the author, at the request of M. Chevaliier, 

 has made several experiments. The object in undertaking them 

 was to determine the proportion of arsenic contained, in what state 

 of combination it existed, and the nature of the action which these 

 arseniferous deposits exerted on the animal oeconomy. 



The first experiment was made on the deposit from the waters of 

 Wattviller (Haut Rhin). In order to ascertain the quantity of 

 arsenic, a portion of the residue was treated with nitro-hydrochloric 

 acid, to convert all the arsenic which it might contain into arseniate 

 of iron. 



This residue, washed with distilled water, was calcined in a silver 

 crucible with twice its weight of hydrate of potash ; the product of 

 this calcination was treated with hot distilled water, and the liquid 

 was filtered to separate the insoluble deposit ; the filtered hquid was 

 supersaturated with nitric acid, and the solution evaporated to dry- 

 ness. The residue, redissolved by distilled water, gave a solution to 

 which was added solution of acetate of lead ; this produced a white 

 flocculent precipitate which was collected on a weighed filter. This 



Phil. Mag. S. 3. Vol. 35. No. 238. Dec. 1 849. 2 H 



