L'assainissement ; un manuel pratique pour les inspecteurs sanitaires et autres;avec apxon droit sanitaire, par Herbert Manley . et ainsi démontrer par itspresence, à proximité ou à l'intérieur de la chambre, l'emplacement exact de chacun des 140 ASSAINISSEMENT PRATIQUE. les différents défauts. Il faut se rappeler que, lorsqu'smokecan pénétrer les gaz d'égouts, peut, et la démonstration du danger oculaire dans laquelle les détenus de la maison sont exposés, être willoften les moyens de les convaincre de la nécessité forcertain modifications, qui pourraient autrement rencontre l'opposition, en raison de la charge ou de l'inconfort temporaire qu'ils impliquent.

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Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . and thus demonstrate by itspresence, near to or within the house, the exact site of each of 140 PRACTICAL SANITATION. the various faults. It must be remembered that where smokecan penetrate, sewer gas may, and the ocular demonstration ofthe danger to which the inmates of the house are exposed, willoften be the means of convincing them of the necessity forcertain alterations, which might otherwise meet with opposition, on account of the expense or temporary discomfort they involve.There is nothing like smoke to convince a sceptic that thesuggestions of an expert have a solid foundation in fact, and arenot, what they are too often supposed to be, the outcome of atheorists imagination. In applying the smoke-test, one of the various apparatus thatare made for the purpose jnust be used, and the best openingat which to blow in the smoke is the air-inlet to the drain onthe house side of the trap which disconnects it from the seweror cesspool, or, failing this, it may be introduced at any con-. Pig. 88. venient trap, by removing its water-seal. As soon as the smokeis seen to issue from the various soil-pipe or drain-ventilators, they must be plugged, as all are then charged with smoke, andafterwards a little pressure applied by the apparatus, notsufficient, however, to force the various traps, will send thesmoke through all imperfections, if it has not already found itsway through, which is more than likely. For small systems of drains, handy little machines are madewhich answer the purpose, but it is well to use one of thelarger apparatus, such as Burn <fc Baillies (fig. 88), in the caseof large premises. This apparatus consists of a double-actionbellows, which communicates with a cylinder in which thesmoke is generated by burning oily cotton-waste, and fromwhich it is carried by a pipe into the drain. At the end ofthis pipe a flange surrounded by an india-rubb

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