The
breath smells of gas; there is profound stupor; the patient, if alive,
exhales gas from the lungs when removed into a fresh room or into the
air. Smell of gas in the room and in patient's breath.
_Post-Mortem Appearances._--Pallor of skin and internal tissues; florid
colour of neck, back, and muscles, if much CO present in the coal gas;
fluid florid blood; infiltration of lungs.
_Treatment._--Fresh air, artificial respiration, cold affusion,
diffusible stimulants; inhalation of oxygen freely.
=Sulphuretted Hydrogen= is characterized by its odour, like that of
rotten eggs. It is extremely poisonous.
_Symptoms._--Giddiness, pain and oppression in stomach, nausea, loss of
power; delirium, tetanus, and convulsions.
_Post-Mortem Appearances._--Fluid and black blood (sulph-haemoglobin),
smell of H_{2}S on opening the body; loss of contractility of muscles,
rapid putrefaction.
_Treatment._--Fresh air, stimulants, inhalation of chlorine.
_Tests._--Acetate of lead throws down a brown or black precipitate
according to the quantity of the gas.
=Sewer Gas.=--Cesspool emanations usually consist of a mixture of
sulphuretted hydrogen, sulphide of ammonium, and nitrogen; but sometimes
it is only deoxidized air with an excess of carbonic acid gas.
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