coal-tar products are cheap, effective, and easily applied
disinfectants, their action being due to the carbolic acid and creosote in
their composition. They may be used in 3 to 5 per cent solution. As a rule
they form a milky solution in water.

(7) Compound solution of cresol (liquor cresolis compositus), now
recognized as an official preparation, is composed of equal parts of cresol
and linseed-oil-potash soap. The mixture is a thick, dark, amber-colored
fluid which mixes readily with water in all proportions to form a clear,
soap solution. It is an efficient disinfectant in a 3 or 4 per cent
solution, and in this strength it may be applied in the same manner as a 5
per cent solution of carbolic acid.

When it is desired to apply one of these above-mentioned agents to the
stable or barnyard, a preliminary cleaning up of all debris and litter is
advisable, together with the scraping of the floor, mangers, and walls of
the stable with hoes; also the removal of all dust and filth. This should
be followed by the burning of all such accumulations, inasmuch as this
material likewise contains the infectious principle and is best destroyed
by heat. Heat may be applied to the surface of the affected pen, byre, or
barnyard by means of a cyclone burner, which consists of a tank, pump,
hose, and cyclone nozzle for spraying with paraffin (gas oil). The latter
is ejected in the form of spray, which when ignited gives a very hot and
effective flame to be applied to the infected ground. Where such burning is
impracticable the surface soil of the yard and surroundings should be
removed to a depth of 5 or 6 inches and then placed in a heap and
thoroughly mixed with air-slaked lime. The fresh surface of the soil thus
exposed may then be sprinkled with the disinfectant.

In addition to these artificial substances there are several natural
sanitary agents of great importance as destroyers of virus. These are
cleanliness, ventilation, drying, and sunshine. All virus, excepting such
as may live in the soil, is killed sooner or later by drying and sunshine,
and the importance of these factors in the daily life of animals need not
be insisted on here. Finally, all sanitary measures which contribute to the
healthfulness of animal surroundings are directly or indirectly inimical to
disease germs, and all carelessness in the keeping of animals may be
regarded as an ally of these destructive organisms.

CONTAGIOUS PLEUROPNEUMONIA.

[Pls.