When the preceding apparatus is used in daylight, so that the objects are illuminated by the rays of the sun, the mirror =M N= is unnecessary. The Kaleidoscope, etc., must, however, be attached to the part of the frame of a Solar Microscope, which goes into the aperture in the window-shutter. As the most brilliant light is obtained from the burning of oxygen, either by itself, or along with coal gas, as in the Bude light,[8] a lamp of this kind is peculiarly fitted for displaying the pictures of the Kaleidoscope to a number of spectators. One of Mr. Bate’s Polycentral Kaleidoscopes was, many years ago, fitted up with a lamp of this kind, for exhibition, at the lectures on natural philosophy, delivered at Guy’s Hospital, by that eminent chemist, the late William Allen, Esq., F.R.S. The patterns which are created by the Telescopic Kaleidoscope from natural objects, or from objects independent of the instrument, may, in like manner, be exhibited to several spectators at once. If the objects are in a room, such as bunches of flowers, statues, human figures, or large pictures, they must be placed in one apartment, and strongly illuminated. The lens must then be placed upon the end =A O= of the Kaleidoscope, the object-plate =C D= having been removed, and must be so adjusted that the images of the objects may fall exactly upon the end =A O= of the reflectors. The objects may be placed at any distance from the lens, from six inches to twelve feet, according to their magnitude, and the pictures will be exhibited with great distinctness and effect upon the wall of the other apartment. If a blazing fire is employed, the most brilliant display of fireworks may be exhibited. When the objects are out of doors, such as trees, shrubs, etc., the Kaleidoscope, with its two lenses, must be fixed in the circular opening of a window-shutter, and the picture received upon white paper, or any other suitable ground, as in the Camera Obscura. [8] This light was first proposed by myself. See _Edinburgh Review_, April 1833, vol. lvii. p. 192. Similar effects may be produced in a portable Camera Obscura, by placing the apparatus =C F L L G D= in the moveable drawer of that instrument. If the lens =L L= is of such a focal length as to admit the formation of the image within the instrument, the picture will be finely displayed upon the ground glass, and may be copied with considerable exactness.