e clinical symptoms are similar.

Disturbances of nerve function are caused in a variety of ways. It is
not within the scope of this work to discuss central nervous
disturbances caused by ingestion of mouldy provender, or disturbances of
the brain or cord occasioned by infectious diseases, but mention of the
existence of such conditions is appropriate.

By direct injury the result of blows, certain nerves are injured and
muscles supplied by such nerves are rendered inactive. Depending upon
the nature and extent of an injury thus inflicted, so the manner in
which the affection is manifested varies. The suprascapular nerve is
rather frequently injured causing partial or complete loss of function
of the structures supplied by this nerve, and abduction of the
scapulohumeral joint naturally results.

In some cases of dystocia the obturator nerve, (or nerves, if the
involvement is bilateral), becomes injured by being caught between the
maternal pelvis and some dense part of the fetus. This results in
paralysis of the adductors of the thigh if sufficient injury is done.

It is said that nerves become over-stretched and held tense, in certain
positions in which animals are obliged to remain while cast in
confinement such as in some instances where unusual methods of restraint
are employed. When the fore feet are drawn backward in such manner that
great strain is put upon the radial nerve, it suffers more or less
injury, and this is followed by partial or complete paralysis which may
be temporary or permanent.

Degenerative changes affecting nerves, as in other tissues, occur and
more or less locomotory impediment will follow--this depending upon the
nerve or nerves affected and the nature of such involvement. Tumors may
surround nerves and eventually the nerve so exposed becomes implicated
in the destructive process. Before degenerative changes take place in
the nerve substance, in such cases, pressure may completely paralyze a
nerve when it is so situated. Melanotic tumors in the paraproctal tissue
in some cases, because of the large size of the new-growths, cause
paralysis of the sciatic nerve. The author has seen one case of brachial
paralysis occasioned by an enormous development of fibrous tissue
involving the structures about the ulna.

AFFECTIONS OF BLOOD VESSELS.

Lameness caused by disturbances of circulation may be due to structural
affection of vessels, or functional disorders of the heart, and in some
inst