extra outlay on the cost of the kilns.  The wall of the kiln is carried up nearly straight for 6 feet, when it is drawn in, so as to become bluntly conical.  Upon the top a plate of iron is fastened in the manner of the keystone of an arch, and bands of iron are passed round the kiln and drawn tight with screw bolts and nuts to strengthen it.  Double doors of sheet-iron are made at the bottom and near the tops, by which it is either filled or emptied, and a few air-holes (B), which may be stopped with loose bricks, left in the bottom.  The second figure shows a kiln of another shape made to burn 3,000 bushels of charcoal, or about 80 cords of wood.  The shape is a parallelogram, having an arched roof, and it is strengthened by a framework of timber 10 inches square.  As the pressure of the gas is sometimes very great, the walls must be built a brick and a half thick to prevent their bursting.  The usual size is 16 feet wide and high, and 40 feet in length, outside measure.  The time occupied in filling, burning, and emptying a small cone is about three weeks, and four weeks is required for the larger ones.—­The Gardeners’ Chronicle.

[Illustration:  KILN FOR BURNING CHARCOAL.]

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ENTRANCE, TIDDINGTON HOUSE, OXON.

Our illustration is a view of the entrance facade to Tiddington House, Oxfordshire, the residence of the Rev. Joshua Bennett.  The house is an old building of the Georgian period, and though originally plain and unpretentious, its bold coved cornices under the eaves, its rubbed and shaped arches, moulded strings, and thick sash bars, made it of considerable interest to the admirers of the “Queen Anne” school of architecture, and led to the adoption of that style in the alterations and additions made last year, of which the work shown in our illustration formed a small part.  Between the “entrance facade” and the wall of the house there is a space of some twenty feet in length, which is inclosed by a substantially built conservatory-like erection of Queen Anne design, forming an outer hall.

[Illustration:  ENTRANCE TIDDINGTON HOUSE OXON.—­Morris & Stallwood—­Architects.]

The works were executed by Messrs. Holly & Butler, of Nettlebed.  The brick carving was beautifully done by the late Mr. Finlay; and the architects were Messrs. Morris & Stallwood, of Reading.—­The Architect.

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NEW ARRANGEMENT OF THE BICHROMATE OF POTASH PILE.