The use of sulphur fumes as a disinfectant has been proved to be practically useless, and formaldehyde has almost entirely replaced it. The easiest form of using this is the "Pure Formaldehyde Gas" put up by Sea-bury & Johnson. It can be procured at most druggists. In appearance it looks like a stone, cone shaped. There are two sizes; the smaller, 2 inches square, will disinfect a room 500 cubic feet, and the larger one, 1000 to 1500 cubic feet. Close the windows, pasting paper over all the cracks; pull down the blinds; open cupboards, drawers, bundles, etc., that everything may be exposed to the fumes of the gas; place the fumi-gator on the top of an inverted pail-it must not be too near the floor, or it may scorch it-set fire to the top of it, and leave the room; lock the door and paste up the cracks and key hole.

Leave the room thus for five or six hours, then open all the windows, if possible allowing them to remain open for twelve hours.

Books and toys used in the sick-room should be burned, as they are hard to disinfect.

Unless the mattress can be baked it should be opened, so that the formaldehyde can penetrate through to its center. In all large cities there are bake houses where such things may be sent for disinfection at comparatively small cost. They should be carefully wrapped up.

Disinfecting with Formaldehyde

The Mattress