=Nitroglycerine= gives rise to intense and persistent headache ('powder
headache'). Throbbing and pulsation of all the arteries in the body;
flushing of the face and collapse may follow.
=Dinitrobenzene= causes symptoms resembling nitro-benzol poisoning, and
when acting as a chronic poison gives rise to weakness, jaundice,
peripheral neuritis.
XXXVIII.--SULPHONAL, TRIONAL, TETRONAL, VERONAL, PARALDEHYDE
These are dangerous drugs. The ordinary _symptoms_ of the group are
noises in the ears, headache, vertigo, inability to stand or to walk
properly, insensibility, and cyanosis.
The most interesting point is the condition of the urine. In cases of
poisoning it is dark or reddish-brown in colour, due to the presence of
_haematoporphyrin_. It contains albumin and casts, but no red corpuscles.
In cases of haematoporphyrinuria the prognosis is bad, and it is said
that these cases invariably end fatally.
_Treatment._--In an ordinary case emetics, strong coffee, hypodermic
injections of strychnine, saline injections, and transfusion.
Cases of chronic poisoning from the 'als' are not uncommon, and are
increasing in frequency.
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