Silver has been discovered in all the states, either alone or in the form of sulphides, antimonial and arsenical ores, chloride, bromide,.
In response to an agitation originated by certain manufacturers (one of whom was a member of parliament), who were prosecuted for omitting to label arsenical and nicotine preparations as poisons, as required by the Pharmacy Act of 1868, a new act was passed in 1908, by which persons, without any training in toxicology, and being neither pharmaceutical chemists, nor chemists and druggists, may be granted licences by local authorities to sell poisonous substances used exclusively in agriculture or horticulture, for the destruction of insects, fungi or bacteria, or as sheep dips or weedkillers, but which are poisonous by reason of containing the scheduled poisons, arsenic or nicotine, &c. One condition concerning the granting of such licences has been, it is said, deliberately ignored in many towns, viz.
To check them, " grease-banding " round the trees has been adopted; but as many other pests eat the leafage, it is best to kill all at once by spraying with arsenical poisons.
The two most useful arsenical sprays are Paris green and arsenate of lead.
Arsenical soap is very much employed by taxidermists for the preservation of the skins of birds and mammals.
Antimonial, bismuth and arsenical compounds were assiduously studied, a direct consequence of their high medicinal importance; mercurial and silver compounds were investigated for the same reason.
Throughout the world, primary deposits of tinstone are in or closely connected with granite or acid eruptive rocks of the same type, its mineral associates being tourmaline, fluorspar, topaz, wolfram and arsenical pyrites, and the invariable gangue being quartz: the only exception to this mode of occurrence is to be found in Bolivia, where the tin ore occurs intimately associated with silver ores, bismuth ores and various sulphides, whilst the gangue includes barytes and certain carbonates.
In diameter, leaves the stamps in suspension in water, and passes through a series of troughs in which the heavier mineral is collected; this then passes through a series of washing operations, which leaves a mixture consisting chiefly of tinstone and arsenical pyrites, which is calcined and washed again, until finally black tin containing about 60 to 65% of metal is left.
Magnetic pyrites, copper pyrites, zinc blende and arsenical pyrites are other and less important examples, the last constituting the gold ore formerly worked in Silesia.
Plattner, who suggested that the residues from certain mines at Reichenstein, in Silesia, should be treated with chlorine after the arsenical products had been extracted by roasting.
It is known also as arsenopyrite or arsenical pyrites (Ger.
Arsenical varieties of marcasite, containing up to 5% of arsenic, are known as lonchidite and kyrosite.
Other mineral substances obtained in small quantities are: pyrite, in St Lawrence county; arsenical ore, in Putnam county; red, green and purple slate, in Washington county; garnet in Warren, Essex and St Lawrence counties; emery and felspar, in Westchester county; and infusorial earth in Herkimer county.
When employed as a group-name the constituent species are distinguished by prefixes: thus the type is called iron pyrites, whilst other species are known as copper pyrites, arsenical pyrites, &c. The original word pyrites (from Gr.
It is, however, a useful superficial caustic and antiseptic. All copper compounds are poisonous, but not so harmful as the copper arsenical pigments.
In acute poisoning by it the symptoms are almost identical with those of arsenical poisoning, which is much commoner (See Arsenic).
(r) Argenti nitras (United States and British pharmacopoeia), lunar caustic, incompatible with alkalis, chlorides, acids, except nitric and acetic, potassium iodide and arsenical solutions.