tion-tube Melts, boils, is volatilized, and forms
a white crystalline sublimate.
5. With ether Freely soluble; the ethereal solution,
when allowed to evaporate
spontaneously, deposits the salt in
white prismatic crystals.
6. Heated with carbonate of Globules of metallic mercury are
sodium in a reduction-tube produced.

A very simple process for detecting corrosive sublimate is to put a drop
of the suspected solution on a sovereign and touch the gold through the
solution with a key, when metallic mercury will be deposited on the
gold.

XXIV.--LEAD AND ITS PREPARATIONS

=Acetate of Lead= (Sugar of Lead).--A glistening white powder or
crystalline mass. Soluble in water, with a sweetish taste. It is
practically the only lead salt which gives rise to acute symptoms, and
only when taken in large doses.

_Symptoms._--Metallic taste, dryness in throat, intense thirst,
vomiting, colicky pains, cramps, cold sweat, _constipation_ and scanty
urine, severe headache, convulsions.

_Chronic lead-poisoning_ is liable to occur in those who handle lead in
any form--white-lead workers, paint manufacturers, plumbers, pottery
workers, etc.

In chronic lead-poisoning the most prominent symptoms are a blue line on
the gums, anaemia, emaciation, pallor, quick pulse, persistent
constipation, colic, cramps in limbs, and paralysis of the extensor
muscles, causing 'dropped hand.' May get _saturnine encephalopathies_,
of which intense headache, optic neuritis, and epileptiform convulsions,
are the most common. Albumin in urine, tendency to gout, and in women to
abortion.

_Post-Mortem Appearances._--Inflamed mucous membrane of stomach and
intestines, with layers of white or whitish-yellow mucus, impregnated
with the salt of lead.

_Treatment._--Sulphate of sodium or magnesium, or a mixture of dilute
sulphuric acid, spirits of chloroform, and peppermint-water. Milk, or
milk and eggs. As a prophylactic among workers in lead, a drink
containing sulphuric acid flavoured with treacle should be given.
Lavatory accommodation should be provided, and scrupulous cleanliness
should also be enjoined in the workshops. The dry grinding of lead salts
should be prohibited. The ionization method of Sir Thomas Oliver is
most useful both as regards cure and also prevention of chronic
poisoni