L. A. Gouch, architect, Harlem, has shown us plans for cast-iron partition wallSj which appear to be far superior in every respect, and can be put up for less than those of brick. They are formed of perforated plates bolted together, each of about one-sixteenth of an inch in thickness, and secured so as to make a partition of four inches in thickness, having an air space between, which will answer for ventilation, gas pipes, water pipes, and hot air pipes. These plates can be covered with plaster and made to resemble a hard-finish wall. These partitions will be fireproof, and flanges are cast upon them for joists and beams of flooring and stairs. Such a partition can be taken down at any time, by merely unscrewing the bolts, and not like brick, mortar,'and iath walls, it will be as good as ever, and can answer the same pur-posela thousand times over, and last for a thousand years. The application of iron to architecture is an invention which should attract universal attention.