13 6. "Experiments how to know Arfenic . 
per into a beautiful Refemblance of Silver* 
but renders it brittle at the fame Time. 
Otto 
ARSENIC being the Poifon mofr commonly made Ufe 
of by wicked People to deftroy others* and by defpairing 
V/retches to pat an End to their own Lives, I fhal! 1 hope 
beexcufed, for adding this Note of Inftrudtion how'to make 
Trial of any Subftance fufpe&ed of being Arfenic: and like- 
wife how to judge of the Symptoms it produces when taken ; 
colle&ed from the recent unhappy Cafe of Mr, Biandy. 
This Gentleman was poifoned by Arfenic* given him by 
his own Daughter in Water Gruel; at the Bottom of a 
Pan of which a Servant Maid finding an unufual white 
gritty Subftance, and fufpedting Mifchief, from having feen 
her Miftrefs ftirring fomething into it, fhe fhewed it to an 
Apothecary, who faved a little Quantity of the Sediment, 
which was dried, and examined by Dr. Addington. 
The Doftor’s Account of White Arfenic upon the Trial 
of Mifs Biandy, was, that when powdered it has a milky 
Whitenefs, is gritty and almoft infipid. Part fvvirnson the 
Surface of cold. Water like a pale fulphureous Film, but 
the greateft Part finks to the Bottom, and remains there 
undhTolved. Thrown on red-hot Iron, it does not flame, 
but rifes iritirely in thick white Fumes, which have the 
Stench of Garlic, and cover cold Iron held over them with 
white Flowers. The Powder he examined did exactly the farne^ 
Fie boiled ten Grains of powdered Arfenic in four Ounces 
of clean Water, which he filtered, divided into five equal 
Parts, and put into as many Glaffes.—On pouring into the 
find Glafs a few Drops cf Spirit of Sal Ammoniac, it threw 
down a few Particles of a pale Sediment. Some Lixivium 
of Tartar poured'into the fecond, produced a white Cloud, 
hanging a little above the Middle cf the Glafs. Strong 
Spirit of Vitriol poured into the third, made a confider- 
able Precipitation of a lightifh coloured Subfiance, which, 
hardened into glittering Cryfials, flicking to the Sides and 
Bottom of the Glafs. Spirit of Salt poured into the fourth, 
precipitated a lightifh coloured Subftance. Syrup of Violets 
in the fifth, produced a beautiful pale green Colour.—r- 
Ten Grains of the Sediment from the Gruel, tried in the 
fame Manner, afforded the fame Appearances exactly. 
The Symptoms produced by this Poifon in Mr. Biandy, 
were burning and pricking in the Tongue, Throat, Stomach, 
and Bowels, Sicknefs, Gripings, Vomiting and Purging, 
