And so the Calder receives the filth of all Halifax through the Hebble, and (the two rivers flow on lovingly to the point where their water is filtered and supplies Wakefield, The'Medlock and the Irwell are also "silent high, ways" for filth through Salford, and about two mil lious and a half have been laid out already on casting , forth the refuse of London into the Thames. JEyery experiment to deodorise water only ends in vanity and vexation, and by slow degree* the Bey. Henry Moule'a doctrine, that in household service it is cheaper to procure dry earth than to spoil water/ meets with fuller acceptance Mr. Wilson, of Edgmgton Mains, speaks of Mr, Moule'a method as the only one which practically effects the separation of the fertilising matter from the water in whioh it is contained, and points out tb,a.t earth with much or. ganib matter in it deodoiises more rapidly than when it contains little. Ashes, soot, or charoual may all be used for this purpose, provided they are kept from wet : nut dry earth or clay subsoil, small and well sifted, are the most active deodorisers. Hence the peculiar applicability of earth instead of water to closets. The earth must be supplied in detail and not |n masses, and these layers ate, in fact, the whole t , secret of the process. Tts deodorising agency is so powerful that, when the deposits are removed and placed under cover, the mass smells like fresh loam. Every trace of the original and its accompaniments is so completely absorbed that the same earth can be used eight or ten times. The mfesfc. through which it should be sifted is about a fourth of an inch, and lib. 9oz , or 14 pints, should descend from, (he box, at each time of usfng. \\ haj? begin arguect that the necessary manipula* tiori 1 would act practically as a veto on the system ; but it may be urged in reply that it is easier to carry dry earth upstairs than to pump water into a cistern, especially when frost has the pipes in its grip. Pub lic institutions have found no difficulty in its appli- ' cation. Through the influence of Dr. 