ON MURI4TE OFZHW.if'- \S5 



with the recent solution, 1 caused a large quantity of at- 

 mospheric air to pass through it by means of a pair of bel- 

 lows, the nozzle of which reached to the bottom of the liquid. 

 If the solution be rot fully saturated with tin, it will take 

 up a fresh quantity in proportion as it absorbs oxigen from 

 the atmosphere. 



Oximuriatic acid gas is eagerly absorbed by this solution, and oximuria* 

 as Pe Metier very justly observed. This learned chemist tlc acid G as » 

 evei uroposed a solution so saturated fo'the purpose of dye- 

 ing scarlet; and I prevailed on several dye/s to make trial 

 of it, but none of them adopted its use. It appears, that which has a si- 

 the combination of atmospheric oxigen with it imparts to ^ ar e ec oa 

 it nearly the same properties as oximuriatic acid gas. 

 When it has absorbed a great deal of oximuriatic acid 

 gas. it is fit for dissolving a fresh quantity of tin, and when 

 it has dissolved more tin, its state is altered, and it is ren- 

 dered again capable of absorbing oxigen gas. 



The muriatic solution of tin at 45° yields crystals of mu- Crystallization 

 riate of tin, by evaporation. The crystallization is effected ° c sdutfon^of 

 more easily, in proportion to the length of time the solution tin. 

 has been kept, or to the quantity of oxigen it has absorbed. 

 The mother water, in which the crystals are deposited, is of 

 great density, particularly after several crystallizations, Its 

 density is still greater, if it were evaporated before its ex- 

 posure to the air: it is sometimes even slightly fuming, and 

 will then yield crystals on being diluted with pure water. 

 A phial that would hold 14 parts of distilled water, contained 

 28 of the mother water after the 'first crystallization: and 

 it held 31, when the same liquid had furnished several crops 

 of crystals by evaporation. These mother waters are capa- 

 ble of combining with the oxigen of the atmosphere, if the so- 

 lution were not previously saturated with it : and for this pur- 

 pose it is sufficient to expose thern to the air, or force the air 

 through them with a pair of bellows, as I have pointed out 

 above for the simple solution. This coinbinatiou occasions 

 a fresh production of crystals, and if a very extensive sur- 

 of the mother water be exposed to the air, a muriate 

 of tin crystallized in very thin and light scales will be ob- 

 tained. Baume noticed this mode of crystallization. Oxi- 

 muriatic acid ga» combines with the mother water with 



much 



