. A system of chemistry : comprehending the history, theory, and practice of the science, according to the latest discoveries and improvements ; illustrated with copper plates . \^ Di/1,11ZZ^zTv Sua limeZ^z ff PrecipitateG\, tRetoriXX< 7//« iiemlwTt T; t , StratumSicherSbutumCC. Coi^nu (i rrt Tfartsnqrn^r . /7i,y//, Soluble 0 \ Gunce 3 VbxAPeund th\{.i/l/V////\ -nr/An Ife $. Theory. CHEMISTRY. 69 Waters^&c. folve a part ofalmoft every metalline fubftance, exceptg gold, filver, and platina; but, excepting copper,which may be formed into cryftals by means of
. A system of chemistry : comprehending the history, theory, and practice of the science, according to the latest discoveries and improvements ; illustrated with copper plates . \^ Di/1,11ZZ^zTv Sua limeZ^z ff PrecipitateG\, tRetoriXX< 7//« iiemlwTt T; t , StratumSicherSbutumCC. Coi^nu (i rrt Tfartsnqrn^r . /7i,y//, Soluble 0 \ Gunce 3 VbxAPeund th\{.i/l/V////\ -nr/An Ife $. Theory. CHEMISTRY. 69 Waters^&c. folve a part ofalmoft every metalline fubftance, exceptg gold, filver, and platina; but, excepting copper,which may be formed into cryftals by means of the vo-latile alkali, none of them will alfiime a cryftallineform when united with alkalies. Arfenic, on thecontrary, unites very readily with fixed alkalies, andfhoots with them into a neutral fait. If it is mixedwith nitre, it unites itfelf to the alkaline balls of thatfait, and expels the acid in very volatile fumes, whichare difficultly condenfed into a blue liquor. The rea-fon of this is the great attraction between the nitrousacid and phlogifton, which are always difpofed to unitewhen a proper degree of heat is applied. Was thephlogifton contained in large quantity in the arfenic,and the heat fufficiemly great, a violent deflagrationwould enfue; but as the acid of arfenic attracts thealkaline part of the nitre, at the fame time that the ni-trous acid attracts the phlogifton, a double
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