The residue of the material after digestion with
hydrochloric acid and potassium chlorate may have to be examined for
silver, lead, and barium.
For the detection of minute quantities, the microscope must be used, and
Guy's and Helwig's method of sublimation will be found advantageous.
Crystalline poisons may be recognized by their characteristic forms.
IX.--THE MINERAL ACIDS
These are sulphuric, nitric, and hydrochloric acids.
_Symptoms of Poisoning by the Mineral Acids._--Acid taste in the mouth,
with violent burning pain extending into the oesophagus and stomach, and
commencing immediately on the poison being swallowed; eructations,
constant retching, and vomiting of brown, black, or yellow matter
containing blood, coagulated mucus, epithelium, or portions of the
lining membrane of the gullet and stomach. The vomited matters are
strongly acid in reaction, and stain articles of clothing on which they
may fall. There is intense thirst and constipation, with scanty or
suppressed urine, tenesmus, and small and frequent pulse; the lips,
tongue, and inside of the mouth, are shrivelled and corroded. Exhaustion
succeeds, and the patient dies either collapsed, convulsed, or
suffocated, the intellect remaining clear to the last.
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