For the roof, take common 3x4 joists, as rafters; or, in place of them, poles from the woods, long enough, in a pitch of full 35deg from a horizontal line, to carry the roof at least four feet over the outside of the plates, and secure the rafters well, by pins or spikes, to them. Then board over and shingle it, leaving a small aperture at the top, through which run a small pipe, say eight inches in diameter--a stove-crock will do--for a ventilator. Then set in, 4 little posts, say two feet high--as in the design--throw a little four-sided, pointed cap on to the top of these posts, and the roof is done. If you want to ornament the under side of the roof, in a rude way--and we would advise it--take some pieces of 3x4 scantling, such as were used for the roof, if the posts are of sawed stuff--if not, rough limbs of trees from the woods, to match the rough posts of the same kind, and fasten them to the posts and the under side of the roof, by way of brackets, as shown in the design. When the ice is put into the house, a close floor of boards should be laid on joists, which rest on the plates, loosely, so that this floor can be removed when putting in ice, and that covered five or six inches deep with tan, or saw-dust--straw will do, if the other can not be had--and the inside arrangement is complete. Two doors should be attached to the opening, where the ice is put in and taken out; one on the inner side of the lining, and the other on the outer side, both opening out. Tan, saw-dust, or straw should also be placed on the top of the ice, when put in, so as to keep the air from it as much as possible; and as the ice is removed, it will settle down upon, and still preserve it. Care must be taken to have a drain under the floor of the house, to pass off the water which melts from the ice, as it would, if standing there, injure its keeping. It will be seen, that, by an error in the cut of the ground plan, the inside line of posts does not show, as in the outer line, which they should do; nor is the outside door inserted, as is shown in the elevation. These defects, however, will be rectified by the builder. We have given considerable thought to this subject, and can devise no shape to the building more appropriate than this, nor one cheaper in construction. It may be built for fifty to a hundred dollars, according to the cost of material and labor, and the degree of finish given to it.