The solution of nitrate of lead may now have the proper tests applied.
_Tests._--Sulphuretted hydrogen gives a black precipitate; liquor
potassae, white precipitate; sulphuric acid, white precipitate, insoluble
in nitric acid; iodide of potassium, a bright yellow precipitate. A
delicate test for lead in water is to stir the water, concentrated or
not, with a glass rod dipped in ammonium sulphide: a brown coloration is
produced. One-tenth of a grain of lead in a gallon of water may be
detected.
Chronic lead-poisoning is an 'industrial disease,' and, being an
occupation risk, its victims are entitled to compensation at the hands
of their employers. In case of death, compensation has been awarded even
when at the autopsy the patient has been found to have suffered from
acute tuberculosis of the lungs. The responsibility of apportioning the
monetary value of disablement resulting from the action of the lead
rests with a judge or jury, who are guided by the expert medical
evidence available.
Diachylon, or lead-plaster, is largely used as an abortifacient.
XXV.--COPPER AND ITS PREPARATIONS
Poisoning with copper salts is rare.
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