This means filling the place with fumes, and allowing these to have a prolonged action upon the walls of the cattery by exclusion of the surrounding atmosphere.

Sulphurous acid gas, formalin, and chlorine gas are the principal fumigating media.

The first-named is made by throwing a handful of flowers of sulphur upon some hot coals on a shovel.

Formalin tabloids ready for use, together with the needful apparatus, can be obtained, with instructions, from a chemist, or it may be improvised from a night-light, and shallow saucer.

The fumes are very irritating, probably more so than chlorine gas.

Needless to say, all live stock must be removed before fumigation.