A small room or enclosure must be erected to contain the machine.

The question of how far the removal of smoke from the atmosphere would affect the various gases of combustion floating therein is a question for the chemist. The plan that has been here proposed is founded on the supposition that Nature’s law, relative to the diffusion of gases, permits only carbonic acid gas, the chief product of combustion, to remain in the proportion of 1 in 2000. The introduction of so much water in the sewer, where its presence already is considered an injury to the sewage, is an objection, but the present system of drainage requires a plentiful supply of water, to prevent stoppages or choking. Should the dry earth system ever be generally introduced, the present sewers would serve to remove liquid sewage and all products of combustion. The operation of the sewer in any way in receiving this smoke and soot, would permit the full and cheering light of the sun to shine alike in country and town.

DESIGN No. 36.
A LECTURE HALL, OR LITERARY INSTITUTION.

Elevation.

THIS design was made to refront an old chapel in the country which had been purchased for the purpose of forming a Literary Institute. The interior

Tablet in front.