e regarded as disinfection by laymen, but in municipal
disinfection the disinfector must be thoroughly versed in the science
of disinfection and be prepared to apply its dictates to practice.

=Rooms.=--In the disinfection of rooms the disinfectant used varies
with the part of the room as well as with the character of the room.
When a gaseous disinfectant is to be used sulphur dioxide or
formaldehyde is employed, with the tendency lately to replace the
former by the latter. Wherever there are delicate furnishings,
tapestries, etc., sulphur cannot be used on account of its destructive
character; when sulphur is employed it is, as a rule, in the poorer
class of tenement houses where there is very little of value to be
injured by the gas, and where the sulphur is of additional value as an
insecticide. Whenever gaseous disinfectants are used the principal
work of the disinfector is in the closing up of the cracks, apertures,
holes, and all openings from the room to the outer air, as otherwise
the gaseous disinfectant will escape. The closing up of the open
spaces is accomplished usually by means of gummed-paper strips, which
are obtainable in rolls and need only to be moistened and applied to
the cracks, etc. Openings into chimneys, ventilators, transoms, and
the like must not be overlooked by the disinfector. After the openings
have already been closed up the disinfectant is applied and the
disinfector quickly leaves the room, being careful to close the door
behind him and to paste gummed paper over the door cracks. The room
must be left closed for at least twelve, or better, for twenty-four
hours, when it should be opened and well aired.

=Walls and Ceilings= of rooms should be disinfected by scrubbing with
a solution of corrosive sublimate or carbolic acid; and in cases of
tuberculosis and wherever there is fear of infection adhering to the
walls and ceilings, all paper, kalsomine, or paint should be scraped
off and new paper, kalsomine, or paint applied.

=Metal Furniture= should first be scrubbed and washed with hot
soapsuds, and then a solution of formalin, carbolic acid, or
bichloride applied to the surfaces and cracks.

=Wooden Bedsteads= should be washed with a disinfecting solution and
subjected to a gaseous disinfectant in order that all cracks and
openings be penetrated and all insects be destroyed.

=Bedding, Mattresses, Pillows, Quilts, etc.=, should be packed in
clean sheets moistened with a five per cen