ng by lead.

_Fatal Dose and Fatal Period._--Uncertain.

_Method of Extraction from the Stomach._--Dry the contents of the
stomach or portions of the liver, etc., and incinerate in a porcelain
crucible. Treat the ash with nitric acid, dry, and dissolve in water.
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. The most important are the
sulphate, subacetate, and arsenite.

=Sulphate of Copper= (bluestone, blue vitriol) in half-ounce doses is a
powerful irritant. Has been given to procure abortion.

=Subacetate of Copper= (verdegris) occurs in masses, or as a greenish
powder. Powerful, astringent, metallic taste. Half-ounce doses have
proved fatal.

_Symptoms._--Epigastric pain, vomiting of bluish or greenish matter,
diarrhoea. Dyspnoea, depression, cold extremities, headache, purple line
round the gums. Jaundice is common. A _chronic_ form of poisoning may
occur, with symptoms closely resembling those of lead.

_Post-Mortem Appearances._--Inflammation of stomach and intestines,
which are bluish or green in colour.

_Treatment._--Encourage vomiting. Give albumin or very dilute solution
of ferrocyanide of potassium.

_Method of Extraction from the Stomach._--Boil the contents of the
stomach in water, filter, pass hydrogen sulphide, filter, collect
precipitate and boil in nitric acid, filter, dilute filtrate with water
and ap