r a space of ten
weeks after the last case occurring; the disinfection of stalls vacated
by slaughtering; the closing of infected places to all passing of
cattle; especial attention to the removal of the dung, and of the
remains of the carcasses of slaughtered beasts; and, finally,
undeviating severity of the law against violators."

Dr. Williams, of Hasselt, suggested and carried out, in 1851, the
inoculation of the virus of pleuro-pneumonia, in order to induce a mild
form of the disease in healthy animals, and prevent their decimation by
the severe attacks due to contagion. He met with much encouragement, and
perhaps more opposition. Didot, Corvini, Ercolani, and many more
accepted Dr. Williams's facts as incontestable, and wrote, advocating
his method of checking the spread of so destructive a plague.

The first able memoir which contested all that has been said in favor of
inoculation, appeared in Turin, and was written by Dr. Riviglio, a
Piedmontese veterinary surgeon. This was supported by the views of many
others. Prof. Simonds wrote against the plan, and, in 1854, the French
commission, whose report has been before mentioned, confirmed, in part,
Riviglio's views, though, from the incompleteness of the experiments,
further trials were recommended.

Inoculation is performed as follows: A portion of diseased lung is
chosen, and a bistoury or needle made to pierce it so as to become
charged with the material consolidating the lung, and this is afterward
plunged into any part, but, more particularly, toward the point of the
tail. If operated severely, and higher up, great exudation occurs, which
spreads upward, invades the areolar tissue round the rectum and other
pelvic organs, and death soon puts an end to the animal's excruciating
suffering. If the operation is properly performed with lymph that is not
putrid, and the incisions are not made too deep, the results are limited
to local exudation and swelling, general symptoms of fever, and gradual
recovery. The most common occurrence is sloughing of the tail; and in
London, at the present time, dairies are to be seen in which all the
cows have short-tail stumps.

Dr. Williams and others have gone too far in attempting to describe a
particular corpuscle as existing in the lymph of pleuro-pneumonia. All
animal poisons can be alone discovered from their effects. In structure
and chemical constitution, there is no difference, and often the most
potent poisons are sim