On the 7th of February 1815, when I discovered the de velopment of the complementary colours, by the successive re?exions of polarized light between two plates of gold and Silver, the effects of the Kaleidoscope, though rudely ezhi bited, were again forced upon my notice; the multiplied images were, however, coloured with the most splendid tints; and the whole e?'ect, though inconceivably inferior to the creations of the Kaleidoscope, was still far superior to anything that I had previously witnessed.