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a. If it exifts in any quantity in water, il 

 may be obtained by fimple evaporation, and 

 either cryftallizing the arfenic or evaporating to 

 drynefs, and then expofing the refiduum to a red 

 heat, in which it will fly off, giving out a ftrong 

 fmell of garlic. 



b. On adding a folution of liver of fulphur, or 

 hepatic air, to a folution of arfenic in water, yel- 

 low clouds will be produced, and a precipitate 

 of the fame colour will fall to the bottom. The 

 arfenic uniting with the fulphur, forms orpi- 

 ment, which is precipitated. 



c. A folution of blue vitriol being added, 

 clouds of a yellowifh green colour will be form- 

 ed, which gradually fall to the bottom. The 

 arfenic, uniting with the copper, forms what is 

 called fcheel's green. 



d. On adding a folution of gold to water 

 containing arfenic, the gold, after fome time, will 

 be precipitated in its metallic ftate. 



e. Upon adding a folution of vitriolated iron, 

 a precipitate, of a dirty green colour, will fall 

 to the bottom. The iron combining with the 

 arfenic. 



f. Mo ft of thefe precipitates alfo will be 

 found volatile in heat, giving the fmell of garlic 

 as they fly off. 



It has been the cuftom to give mucilaginous 

 drinks to perfons that had fwallowed arfenic. 

 Milk, fat, oil, butter, Sec. But Navier, a Phyfi- 

 cian at Chalones, in France, recommends, from 

 his own experience, the calcarious, or alkaline, 

 livers of fulphur as the beft means of counteracl- 

 ing this poifon. Thefe combine with arfenic 

 in the humid, way faturate it, and almoft divert 



it 



