Chalyheate Water f rem Vitars Urldgc, 28^' 



J^ iiA^^le^, therefore, th^ cyxidfe ^ iftiit'^mm^ fl^fla }Pa 

 littfe ift '^kcesa, & circu'mstarice whifch"i^a//4o' a' '6crtii?n cxt^iftj^^ 

 be owing to partial peroxidisement of the ammoniacal prccipl"^' 

 tate, by expo^dtfe'td^^kTri''^ I^'j^roportioiV^ktfH^'ai^fit^^^ 

 lativequantity orj5r<i(6!x!d6''in the wat^r tii^Ufe' Ib^sifiSi tMV'Q^ 

 the black oxide, the ratio of the base and acid will approalM 

 m6^ ^df\f\ that of equality. Wbdii^th^^^f^i^^^^^^ifl^^ 

 to the consistence of a sirup, I found {hat aTcohbl-'t'ook iVp hardl^'^" 

 any of the residue. Neither did it cause, when added to tMe 

 wMct, arty precipitation of protosalt, — circumstances whicB^ay ^ 

 perhaps arise from some degree of chemical union existing be- 

 tween the salt of iron and the sulphate of alumina, atid inter- 

 fering with the solubility of the persalt in alcohoi^'^^ ^^'^° ^"^^^^ 



Were we to assume the peroxide to be the true base, and tfie^* 

 protoxide to be accidental or insignificant in quantity, the salt 

 would then be a persulphate, composed of 1 atom base + 1 atom 

 acid. * But the common red persulphate of iron is well known 

 to be a sesquisalt. 



I shall content myself in the circumstances, with simply uniting 

 the* quantities of oxide and acid actually found, which cannot, 

 in any view, give a result very far from the truth: "^ .i-^^;--! -- 



In 3 cubic inches of the water we thus havej-i'^'' ""^ ^^'^ ^^'^^ 

 -oig ir . iq ii> i»? cii ciii yd uJ JiTgiiO eiiisjqqij bluow ii 



Persulphate and protosulphate of lr6b;'' - - ^iVf-v- '•- ^S^SfiT fxot 

 Sulphate of alumina ...... G.283 



Sulphate of magnesia , j;, ^ilAoiis.in**^ ■ 



Sulphate of lime, ....... .473 



Common salt and muriate of potash, . .026 



Bi; dW^rioid^lonobuJiJanoDeiii ^dahswd ni ^ciilxi^^no 9nm4*>(|4M 9^1* fli 



fhi'.r *" "-''■•" — ■»- -• -'^^..u., ,„u s.tr r,j ;. ( r-.ft'^n f»7atj;fT nt^i ehiB^ai 



odln imperial pint of 34.659 cubic inches of the¥i^^H^<BHdge* 



water therefore contains, ^S^"^ ** ''^^^ 



ijLniSTi Ilfimalo 



the eisen oxyd oxydul^ his atom of peroxide being twice the weight of tha*.|^ 

 Dr Thomson. The salt contained water of crystallization, and was soluble in 

 that liquid ; and as it was accompanied by sulphate of magnesia, its solution . 

 would, in that respect, also resemble the water under consideration. It 5||^ 

 course proceeded from the decomposition of pjrites of the mine. ,„.^ 



• 3 cubic inches of the water weigh about 814 grains. Hence about 

 19 parts of it contain 1 of solid matter ; or it contains more than 5 per cent 

 of solid matter. Sea water contains about 3 per cent, saline constituents. 



