These are not always classed as a part of the interior finish, but they form a very important part of the interior woodwork and often give more trouble than the standing finish.

Stock Doors. - In houses costing less than $4,000 it is generally necessary to use "stock doors." These are made of pine, and sometimes of whitewood, of certain regular sizes and thicknesses, and are always kept in stock by lumber dealers. Three qualities of stock doors are usually kept on hand, viz.: A, B and C; the A doors,* which are the best, being of clear stock and usually well made. B doors contain a few small knots, and perhaps some sapwood, but will answer for common painted work. C doors should never be specified, as they are unsuited for any but the cheapest class of work. Cypress doors of different designs are also carried in stock in some Eastern cities.

There is a difference in the construction of stock doors. The better class of doors have the tenons glued and wedged, as in custom work, while a cheaper kind are merely glued and pinned with wooden dowels which show on the face.

From the fact that stock doors are kept on hand in a storehouse for some time it is impossible to keep them thoroughly dry, so that they are quite sure to shrink when subjected to furnace heat, and if made of white wood they are also quite liable to warp or "spring."

Size and Thickness of Doors. - Stock doors are made 1 1/8, 1 3/8 and 1 inches thick. The first are sometimes used for closet doors, but the 1 3/8-inch thickness is generally used for ail inside doors less than 3 feet in width and 7 feet in height. Sliding doors, however, should always be at least 1 inches thick, and also all doors 3 feet or over in width or exceeding 7 feet in height, and all outside doors. The sizes of stock doors vary from 2 to 3 feet in width and from 6 feet 6 inches to 7 feet in height, being always made in even inches. The height in inches, above 6 feet, is seldom made less than the width in inches above 2 feet, thus 2 feet 8 inches by 6 feet 6 inches or 2 feet 10 inches by 6 feet 8-inch doors are not usually kept in stock.

Construction - Stock doors are as a rule divided into four panels, as shown in Fig.216, and (in the Eastern and Middle States) may be obtained with plain or raised panels, flush or raised mouldings, as desired. A four-panel door answers very well for sizes not exceeding 2 feet 10 inches by 7 feet, but for larger sizes it is hardly stiff enough.

Five-panel doors, divided as shown in Fig. 217, are sometimes kept in stock. This makes a good strong door, well suited for tenements, schools and buildings of a public nature.

An objection to the ordinary four-panel door is that the middle rail comes at the same height as the lock, so that the mortise for the latter cuts away a large part of the tenon, thereby weakening the door. In a door paneled as in Fig. 217 the lock comes opposite the middle panel and hence does not weaken the door to the same extent. The rails of a door are always tenoned into the outer stiles, which extend the full length of the door, and the middle stile is tenoned into the rails. The panels are set in as shown in Fig. 219, which shows a raised panel and moulding on one side and a plain panel and a flush moulding on the other side. The mouldings are usually fastened in place by small nails or brads, which should not penetrate the panels.

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Fig. 219.

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Fig. 220.

O. G. Doors. - The stock doors commonly sold throughout the West do not have a separate panel mould, but an ogee moulding is worked on the edges of the rails and stiles, as shown in Fig. 230, hence these doors are commonly called O. G. doors. They are a little cheaper than the moulded doors, but are not as good a door, as the panels are not held as securely, and they sometimes shrink so as to draw out of the groove.

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In most of the larger cities several patterns of "front doors " are carried in Stock which answer very well for cottages, but are seldom good enough for a house costing over $2,500.

Sliding Doors. - When a stock or other door is to be used as a sliding door a meeting moulding, similar to that shown in Fig. 221, should be glued and bradded to the meeting edges of the doors and a small moulding, corresponding with the projecting portion of the meeting mouldings, should be carried across the top and down the back of the door. These mouldings fit against the jamb and prevent the face of the door from getting scratched. The tongue and groove on the meeting moulding may be either beveled or curved, as desired. Double doors, hung with butts, often have the meeting rails rebated, which answers well for inside doors, but for outside doors it is better to screw an astragal or weather moulding to the edge of the standing part, as shown in Fig. 222. This protects the joint from the weather and also keeps the doors together better. With very heavy doors an astragal should be screwed to each door, as shown in

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Fig. 224.

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Fig. 233. The above suggestions apply either to stock or custom-made doors.