Now let us get on with the actual construction of the wall forms. Pick out material for the top and bottom plate that will give an overall length of the foundation plus twice the width of a 2- by 4- plus twice the thickness of the form sheathing. Lay off for three studs at the ends, side by side. Now measure from the end of the plates 15- three-sixteenths of an inch and lay off a stud position inside this line. Cut studs the correct length- wall height less two plate thicknesses- and nail the studs and plates together to form the frame. Now apply the sheathing nailing it with one and three-fourths of an inch common nails. Lay out, frame, and sheath the end walls. Remember that the length of the plates here will be exactly the width of the foundation. Stand the end walls up between the side walls and fasten them together at the corners. To do this, bring the outer edge of the end wall stud flush with the end of the side wall and nail the two together with 4-inch double-headed nails. The next step is to frame the inside forms. The inside side wall plates will be the length of the foundation less twice the thickness of the wall. When both sections of one wall are up and wired, fasten the two sections together by means of double-headed nails or bolts. Set up al the inside walls in the same manner. Provision must be made in the wall forms for beam pockets, door and window openings or a crawl-space opening. A beam pocket is formed by a three-sided box, open at the top and at one end. Openings for doors and windows may be frame in two ways. One method is to nail the window or door frame into the form in its correct position. Another method of forming opening is to set rough bucks into the form. The concrete basement floor may be cast in either one or two layers. In the first case, the complete thickness is placed in one operation; in the second, a base slab is cast first, over which a topping slab, perhaps slightly different in character, is laid later.