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THE BOOK OF THE LANTERN. 73 also tried; but besides wasting away rapidly, it proved inferior even to magnesia. " Of these substances, and also of their compounds with one another, lime appearing to possess a decided superiority, my subsequent experiments were confined to it alone, and by a more perfect adjustment of the apparatus, by bringing the maximum heat, which is confined within narrow limits, exactly to the surface of the lime ball, and by using smaller balls than those employed in the early experiments, a very material increase of light has been obtained. The mean of ten experiments, made lately with every pre- caution, gives for the light emitted by lime, when exposed to this intense heat, 83 times the intensity of the brightest part of the flame of an Argand burner of the best construc- tion, and supplied with the finest oil. The lime from chalk, and such as is known at the London wharfs by the name of flame lime, appears to b3 more brilliant than any that has been tried. When well-burned Carrara marble is made into a paste with water, and gradually dried, it appears to be nearly equal to the preceding; when strongly com- pressed, or very porous, it is inferior." The best limes to be obtained are of the kind known as "hard," or "Nottingham limes." These last better than any others that I know of. They are sold in tin boxes holding one dozen each, and are packed in powdered lime, kept as far as possible from the air. Let it be remembered that these limes will be spoiled by exposure to damp air. By such exposure they swell to double their normal size, will break the strongest box in which they are confined, and will, finally, fall to powder. In other words, they are