Bulwer, in his romance of _Zanoni_, introduces a mirror of this kind; and every tale of superstition has its magic glass. It is worth while to compare Dee's speculum with the celebrated ink mirror described in Lane's work on the _Modern Egyptians_; it may, at least, illustrate the curious inquiry upon coincident superstitions. ------------------ VOYAGE OF MANUFACTURE. The produce of our factories has preceded even our most enterprising travellers. Captain Clapperton saw at the court of the Sultan Bello, in the interior of Africa, pewter dishes with the London stamp, and had at the royal table a piece of meat served up on a white wash-hand basin of English manufacture. The cotton of India is conveyed by British ships round half our planet, to be woven by British skill in the factories of Lancashire. It is again set in motion by British capital, and transported to the very plains whereon it grew; and is repurchased by the lords of the soil which gave it birth, at a cheaper price than that at which their coarser machinery enables them to manufacture it themselves. At Calicut, (in the East Indies,) whence the cotton cloth called calico derives its name, the price of labour is a fraction of that in England, yet the market is supplied from British looms. ------------------ SIR DAVID BREWSTER'S KALEIDOSCOPE. The idea of this instrument, constructed for the purpose of creating and exhibiting a variety of beautiful and perfectly symmetrical forms, first occurred to Sir David Brewster in 1814, when he was engaged in experiments on the polarization of light, by successive reflections between plates of glass. The reflectors were, in some instances, inclined to each other; and he had occasion to remark the circular arrangement of the images of a candle round a centre, or the multiplication of the sectors formed by the extremities of the glass plates. In repeating, at a subsequent period, the experiments of M. Biot on the action of fluids upon light, Sir David Brewster placed the fluids in a trough, formed by two plates of glass, cemented together at an angle; and the eye being necessarily placed at one end, some of the cement, which had been pressed through between the plates, appeared to be arranged into a regular figure. The remarkable symmetry which it presented led to Dr. Brewster's investigation of the cause of this phenomenon; and in so doing, he discovered the leading principles of the kaleidoscope.