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and beyond the green, a yellow or yellow brown stain is made. This exhibits a remarkable analogy between heat and light,-- before spoken of in chap. II--and is of some practical importance in the preparation of the paper. PRISMATIC ANALYSIS.--The method of accomplishing the prismatic decomposition of rays of light by the spectrum has already been described on pages 22 and 23. The color of the impressed spectrum, on paper washed with nitrate of silver, is at first, a pale brown, which passes slowly into a deeper shade; that portion corresponding with the blue rays becoming a blue brown; and under the violet of a peculiar pinkey shade, a very decided green tint, on the point which corresponds with the least refrangible blue rays, may be observed, its limits of action being near the centre of the yellow ray, and its maximum about the centre of the blue, although the action up to the edge of the violet ray is continued with very little diminution of effect; beyond this point the action is very feeble. When the spectrum is made to act on paper which has been previously darkened, by exposure to sunshine under cupro-sulphate of ammonia, the phenomena are materially different. The photographic spectrum is lengthened out on the red or negative side by a faint but very visible red portion, which extends fully up to the end of the red rays, as seen by the naked eye. The tint of the general spectrum, too, instead of brown is dark grey, passing, however, at its most refracted or positive end into a ruddy brown. In its Photographic application, the nitrate of silver is the most valuable of the salts of that metal, as from it most of the other argentine compounds can be prepared, although it is not of itself sufficiently sensible to light