Persons using these preparations may suffer from catarrhal symptoms,
rashes on the neck, ears, and face, thirst, nausea, pain in stomach,
vomiting, headache, perhaps peripheral neuritis and loss of patellar
reflex. The cacodylates, although formerly employed in the treatment of
phthisis, should be used with the utmost caution. The arsenites give the
reactions of arsenious acid.
Arsenic is eliminated not only by the kidneys and bowels, but by the
skin, and in women by the menses. It may be detected in the sweat, the
saliva, the bronchial secretion, and, during lactation, in the milk.
The sale of arsenic and its preparations to the public is properly
hedged round with restrictions of all kinds. It is included in Part I.
of the Poisons and Pharmacy Act (8 Edward VII., c. 55). No arsenic may
be sold to a person under age, nor may it be sold unless mixed with soot
or indigo in the proportion of 1 ounce of soot or 1/2 ounce of indigo at
the least to every pound of arsenic.
=Arseniuretted Hydrogen= (arsine, AsH_{3}) is an extremely poisonous
gas, and is evolved in various chemical and manufacturing processes.
When damp, _Ferro-silicon_ evolves AsH_{3} and PH_{3}, both very lethal
gases.
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