MIL ^;^rliich ought to be coiistrucled, on three sides, with planks or boards lined with plaster ; the fourth, or south front, should consist wholly of glass, carefully closed with putty, so as to render it completely air-tight. Its dimensions may vary at pleasure, from one to two feet in diameter, internally ; but it should be elevated at least six or eight feet above the roof j as its etfctts will be more or less powerful, accord- ing to its lengtJi. This tube is furnished at the top with a valve i, placed immediately beneath the air-holes, which may be closed when required ; and at the bottom is a similar valve k. The lover pipe, which communi- cates wdth the milk -house, is con- siderably smaller than the upper tube just described. The opening ?«, is closed on ciie side ; and at n _ is a valve, which, when shut, pre- vents any communication betueen this pipe and the external area. — Farther, the top of th.e ventilator is covered with boards, placed in the form of a roof, so that the rain may be thrown off", without im- peding" the current of airj while, by means of the valves above-men- tioned, the air, heated by the adlion of the sun through the outer v.:., w ill immediately escape, thus con- stantly preserving a due. tempera- ture 3 and, by the same means, all damp and confined air, which is extremely pernicious in dairies, V. ill be constantly expelled. The building is furnished v/ith a window placed along the slanting interior rcof at c, and which is closed down with putty, to pre- vent it from being opened. Ano- ther window, g, is lixed over it in a similar manner on the external reelj so as to transmit the light. U i L [20^ without impeding the current cf air betv»cen the tvv'o glfijses. The passage round the m'lk. house ought to communicate with the external air below, only at the threshold of the door E. Bat it w^lU be necessary to make a small aperture on. every side, about one foot in height from the floor, in order that such area maj' be occa- sionally ventilated. Each uf these apertures should be secured- with a piece of thin wire-work, Ln order to prevent the approach of insects, or other vermin ; and ought like- who to be furnished witii a door, or cover, by which it may be open- ed, or closed, according to circum- stances. Farther, if this passage be furnishtd with shelves, and lighted by a glazed window from the inner aparQuent, so as to admit lig/ii only, it may be advanttige- ou.-dy converted into a pantry for keeping butter, cheese, &c. per- fectly ccol, independently of its use for preserving the temperature of the milk-room. The whole of the interior apart- ment should be lini^hed with hard plaster neatly smccthcnt d, and to- t;:liy devoid of ornament, so tiiat it may be cleaned as oltcn as be- comes necessary. In. its centre. Dr. AxDKKSojj direds a large stone table to be placed, being about 24 feet high, 3 feel wide at the least, and of a breadth pro- portioned to the length cf ilie room. Ikneath the tabic is to be fixed a stone trough, correspond- ing to the length and breadth of the former, and being about one foot deep, that is, six Indies above and below the tloor of the milk- house. From the bottom of the trouoh, a pipe is to be conducted, fur the purpose cf carrying oil" t'le water.
