y to the eye.

_Post-Mortem Appearances._--Congestion of cerebral vessels, dilated
pupils, red patches in alimentary canal.

_Treatment._--Wash out the stomach freely; a hypodermic injection of
apomorphine as an emetic, followed by hypodermic injections of
pilocarpine or morphine. Tea, coffee, or tannin, to precipitate the
alkaloid.

_Tests._--Atropine may be recognized by its action on the pupil. The
chloro-iodide of potassium and mercury precipitates it from very dilute
solutions.

=Hyoscyamus= (Henbane).--_Hyoscyamus niger._

=Stramonium= (Thorn-Apple).--_Datura stramonium._

_Symptoms._--Identical with those of belladonna and hyoscyamus, the
_post-mortem appearances_ and _treatment_ being also the same.

=Cannabis Indica= (Indian Hemp).--When smoked, produces intoxication and
mania. _Hashish_, used in the East as a narcotic, may cause persons to
run 'amok' and commit murder.

XXXI.--COCAINE

=Cocaine.=--Any dose above 1/2 grain applied to a mucous membrane or
injected hypodermically may give rise to alarming symptoms. These are
intense pallor, faintness, giddiness, dilatation of pupils, paroxysmal
dyspnoea, rapid, intermittent, and weak pulse, nausea and vomiting,
intense prostration verging on collapse, and convulsions. The patient
may recover if allowed to remain in a recumbent position, but stimulants
by mouth--_e.g._, ammonia--and the hypodermic injection of brandy or
ether may be necessary, with the inhalation of nitrite of amyl.

For care in the prescribing of cocaine see under the 'Dangerous Drugs
Act, 1920' (p. 82).

The =Cocaine Habit= consists in the self-administration of the drug
hypodermically. It induces excitement, which is followed by prostration.
In time melancholia or mania develops, with great irritation of the skin
('cocaine bugs').

XXXII.--CAMPHOR

The liniment, oil, and spirit have been poisonous in large dose.

_Symptoms._--Odour of breath, languor, giddiness, faintness, dimness of
vision, difficulty of breathing, delirium, convulsions, with hot skin,
flushed face, and dilated pupils.

_Fatal Dose._--Thirty grains.

=Cocculus Indicus.=--The fruit of _Anamirta cocculus_. Contains a
poisonous active principle, picrotoxin; used to adulterate beer, and by
poachers to stupefy fish.

_Symptoms._--Convulsions, followed by stupor and complete loss of
voluntary power.

XXXIII.--TETRACHLORETHANE, ETC.

=Tetrachlorethane= ('Cellon').--Acetylene tetrachlo