There were many other galleries on Broadway: Canal Street; the Bowery; the Avenues, 1, 2, and 3; A, B, and C, Water Street; Hudson Street, by the shipping, &c., the proprietors of which conducted their business in the style most suited to their "location" and the class of customers they had to deal with; but in no case was there any attempt at that "old clothesman"--that "Petticoat Lane"--style of touting and dragging customers in by the collar. All sorts of legitimate modes of advertising were resorted to--flags flying out of windows and from the roofs of houses; handsome show cases at the doors; glowing advertisements in the newspapers, in prose and verse; circulars freely distributed among the hotels, &c.; but none of that "have your picture taken," annoying, and disreputable style adopted by the cheap and common establishments in London. Unhappily, "Sunday trading" is practised more extensively in New York than in London. Nearly all but the most respectable galleries are open on Sundays, and evidently do a thriving trade. The authorities endeavoured to stop it frequently, by summoning parties and inflicting fines, but it was no use. The fines were paid, and Sunday photography continued. The "glass houses" of America differ entirely from what we understand by the name here; indeed, I never saw such a thing there, either by chance, accident, or design--for chance has no "glass houses" in America, only an agency; there are no accidental glass houses, and the operating rooms built by design are not "glass houses" at all. The majority of the houses in New York and other American cities are built with nearly flat roofs, and many of them with lessening storeys from front to back, resembling a flight of two or three steps. In one of these roofs, according to circumstances, a large "skylight" is fixed, and pitched usually at an angle of 45°, and the rooms, as a rule, are large enough to allow the sitter to be placed anywhere within the radius of the light, so that any effect or any view of the face can easily be obtained. The light is not any more actinic there than here in good weather, but they have a very great deal more light of a good quality _all the year round_ than we have. The operators work generally with a highly bromized collodion, which, as a rule, they make themselves, but not throughout. They buy the gun-cotton of some good maker--Mr. Tomlinson, agent for Mr. Cutting, generally supplied the best--then dissolve, iodize, and bromize to suit their working.