We learn that the Erie railroad are about to adopt the electric, or Drummond plan, for lighting the Bergen tunnel, according to the suggestions in our article on ligh ting tunnels, published in these columns a few weeks ago. The Bergen tunnel is nearly one mile long and is said to have cost the Erie Railroad four million dollars. A number of railroad ' companies run their cars over the Erie track through this tunnel, and so great is the traffic that a train is within it nearly all the time. The passenger coaches have now to be lighted with lamps, and thus the passage through is a gloomy one. An oxygen light in the middle of the tunnel, with th e use of Frink's patent reflectors, will illuminate the dungeon brilliantly, and the traveling public will hail its adoption with. great satisfaction. The railroad comp anies will probably find that the cost is not greater than the expense attending the oil consumed in the cars, and the liab:ity to accident will be greatly reduced. PAINLESS CUTTING IN SURGERY.—At a late meeting of the British Medical Association, Dr. B. W. Ridiardson exhibited a knife consisting of a revolvin g blade,Tlnd which divided with such rapidity that superficial incisions could be made with it without pain. The revolutions were about twenty- five per second, but the speed might be greatly increased. The knife in its action illustrated that an appreciable interval of time is necessary for fixing an impression on the mind, and for the development of consciousness. He hoped he should soon be able to give to the surgeon a small pocket instrument with which to open abscesses, and perform many minor surgical operations painlessly, without having recourse to either general or local anresthesia. NEW PAVEMENT.—The city of Milwaukee is putting down a kind of pavement, which is described as follows: The old pavement having been removed, the earth is cut to the requisite depth to secure the proper guide for the surface. After the ground-work is thus prepared, it is covered with common inch pine board. Upon this foundation Norway pine plank, two by six inches, are laid edge up and spiked togethe. The planks being green, are readily sprung to the intended curve of the roadway, and then spiked. The pavementfwhen completed, will be covered with fine gravel, which will fill any remaining crevices in the surface. How TO MAKE A VELOCIPEDE USEFUL.—Mr. Glimmer has arranged his velocipede with a churn behind and a coffee- mill in front, these useful domestic utensils being driven by the surplus power of the machine, so that when he takes his morning exercise he churns the butter and grinds the coffee, thus displaying his ingenuity and earning his wife's gratitude. AERO-STEAM MOTORS.—The article on “ Aero-Steam Engines,” published in our last issue, will recall to the recollection of our readers the experim ents of Wm. Mount Storm, made in this city in 1855, in the same field. We intended to give a complete review of these experiments and their results in the present number, but are forced to let the. subject lis over for want of space IT is a fact well-known to artists, that the splendidly bright color of vermilion (cinnabar, sulphide of mercury) has a tendency, especially if it has been mixed with white lead, to become blackish brown and very dark colored in a comparatively short time. This tendency of the vermilion is altogether obviated if, previous to being mixed with oil, it is thoroughly mingled with about tth of its weight of flowers of sulphur. WE are glad to chronicle the fact that sixty-eight thousand children were present on the opening day of the public schools in this city. Give all the children a chance to obtain an education, and if need be compel parents to send their children to school. BY the burning of the skate factory of M. T. Spen-y, at Syracuse, N. Y., on the 17th insfcj twenty-five thousand pairs of skates were destroyed © 1869 SCIENTIFIC AMERICAN, INC.