chial tubes, giving rise to considerable irritation of the air
passages and inflammation. Sometimes the strongyles lodge in large numbers
in the windpipe, forming themselves into a ball, and thus choke the animal
to death.

_Symptoms._--It is liable to attack a number of animals at once, and the
weakest are the first to give way. The animal has a remarkably forcible
cough, distressing, and of a special hacking and paroxysmal character. A
stringy mucus is sometimes expelled during the spells of coughing. This
mucus contains the _Strongylus micrurus_, which can be detected, or their
ova observed, under a low power of the microscope. The attack has a
subacute character and is very exhausting. The parasites, by becoming
entwined in balls, seriously impede respiration, which is always remarkably
labored in this disease.

_Treatment._--The affected calves should be placed in a dry stable,
protected from dampness, and subjected to fumigations of sulphurous
anhydrid or chlorin gas. The liberation of chlorin gas is brought about by
the action of sulphuric acid, either on a mixture of chlorid of sodium and
black oxid of manganese or on bleaching powder. Sulphurous anhydrid may be
procured by burning sulphur. Some practitioners prescribe small doses of
spirits of turpentine in linseed oil. The system requires good support, and
the diet should therefore be liberal and nutritious. Equal parts of
sulphate of iron, gentian, and ginger make an excellent tonic.

_Prevention._--Avoid pastures notorious for generating verminous
bronchitis.

PLEURODYNIA.

Pleurodynia is a term applied to rheumatism of the intercostal muscles, the
apparent symptoms being very similar to those of pleurisy. The animal is
stiff, is not inclined to turn around, and the ribs are kept in a fixed
state as much as possible. Pleurodynia may be distinguished from pleurisy
by the coexistence of rheumatism in other parts and by the comparative
absence of fever, cough, the friction sound, and the effusion into the
chest. The treatment for this affection is the same as that for rheumatism
affecting other parts.

DISEASES OF THE NERVOUS SYSTEM.

By W. H. HARBAUGH, V. S.

[Revised by John E. Mohler, V. M. D.]

THE NERVOUS SYSTEM.

The nervous system is the distinguishing feature of animal life. Without it
there can be no intelligence, no instinct, no sensibility, no perception;
in fact, existence would be nothing more than vegetable life.

The sense