sufficient for disinfecting
5,200 cubic feet of air space.

(3) Crude carbolic acid. The ordinary purified carbolic acid is too
expensive to be used on a large scale, and the crude produce is a very good
substitute. This is made more powerful by mixing with it an equal volume
of commercial sulphuric acid. While the sulphuric acid is being added to
the crude carbolic acid much heat is evolved, and if the glass jar in which
the two are mixed is placed in cold water the resulting product is said to
have a higher disinfecting power. The mixture is added to water enough to
make a 5 per cent solution (about 7 ounces to 4 quarts of water). This is
strong enough for all purposes. It may be kept in wood or glass, but not
in metal, owing to the corroding action of the acid. It should be used
freely on woodwork and on infected floors, and a force pump of the kind
used by orchardists is very convenient as a means of applying the
disinfectant. If the solution is warm when applied, it will penetrate the
woodwork better than when cold, especially if the spraying is done during
cold weather. The addition of air-slaked lime in any quantity that will
dissolve in water to the above solution (say 1-1/2 pounds of lime to 7
ounces of crude carbolic acid to each gallon of water) is preferred by
many, as it makes any neglected places at once visible and leaves cleaner
and better air within the buildings. In most cases in which its
application becomes desirable--and this rule should apply to all
disinfections--the disinfected stables, stalls, etc., should remain vacant
as long as possible before cattle are again stabled therein.

(4) Mercuric chlorid, or corrosive sublimate, is a powerful disinfectant,
but it is likewise very poisonous; hence its uses are limited. Cattle are
especially susceptible to its action and caution must be used in its
application. A solution of one-tenth of 1 per cent is usually sufficient
(1 ounce to 8 gallons of water). It should not be placed in wooden pails,
which would form the tannate of mercury, a weak antiseptic; nor, owing to
its corrosive action, should expensive metal pails be used. Agate vessels
or tin pails are to be preferred. All solutions should be labeled "poison,"
and to avoid accidents none should be kept on hand.

(5) Formalin and formaldehyde gas have been found very efficacious as
sanitary agents. Formalin is the commercial name for the 40 per cent
solution of formaldehyde gas in water, and is on