In the gas factories and metal-smelting houses, and probably in other trades where men are exposed to great heat, a plan is adopted which has considerable physiological interest, and is specially illustrative of the nutritive capabilities of the bath. In the retort-house, the stokers are kept for many hours in a deluge of perspiration; the drain is consequently very active, and it is necessary to supply the loss occasioned by that drain by means of drink. With this object, each man is allowed a certain quantity of oatmeal daily: the oatmeal is served out by the foreman, and is scalded with hot water and made into thin gruel; this is the drink with which the men supply the place of the perspired fluid. They give forth, in the shape of perspiration, water holding in solution the used and useless materials of the frame, and they receive in return a wholesome nutritive material. Can we wonder that these men are perfect Athletæ in form, that they are in the finest possible condition for labour; and that, although working in buildings open to every draught of cold wind, and bathed in perspiration, they never, indeed they cannot, take cold. Let us apply this lesson of the retort-house to the ill-nourished, weakly invalid; or, better still, to weakly, ill-conditioned children. Let us suppose that we have the power, by an easy, pleasant process, of extracting the old, the bad, the useless, even the decayed and diseased, stuff from the blood and from the system by means of the bath; how simple the operation by which we could give back in its place wholesome and nutritious material.--Where would be atrophy and scrofula, if we had this power?--and this power is, I believe, fast approaching, fast coming within our reach, by means of the Eastern Bath. We squeeze the sponge as we will; we replenish it as we will.