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This is suggestive of what other things prove, that it is only by sight they are guided. With respect to the native head-dresses the colouring-matter, "nkola," which seems to be camwood, is placed as an ornament on the head, and some is put on the bark-cloth to give it a pleasant appearance.
On the residue I pour a few drops of ammonia, or else simply water. A glorious crimson colour at once makes its appearance. The problem is solved: the colouring-matter which has just formed is murexide; and consequently the powdery substance which filled the cells was none other than uric acid, or more precisely ammonium urate. A physiological fact of this importance can hardly stand alone.
M. Verdeil informs the Académie, that he has proved the chlorophyll, or resinous green colouring-matter of plants, to be 'a mixture of a perfectly colourless fat, capable of crystallising, and of a colouring principle which presents the greatest analogies with the red colouring principle of the blood, but which has never yet been obtained in a perfectly pure state. He has isolated a quantity for experiment and examination by a chemical process, and has added another fact to the list of those which shew a relation between animal and vegetable functions.
We know but little yet, but we do know that mineral substances are found in the composition of most living animals, if not all; indeed, the colouring-matter of the blood is an oxide and phosphate of iron."
Then the Lama rubbed fat, soot, and brown colouring-matter into the skin, and when I looked in a small hand-glass I could hardly recognise myself; but I seemed to have a certain resemblance to my two Lamaist retainers. In the afternoon a storm broke out from the north, and we crept early into our little thin tent and slept quietly.
Then she glanced at a little jar full of a sort of reddish dye. "Your colouring is too pale," she said. This colouring-matter "raucourt," as the Parisians call it is used to give the butter a fine yellow tint. The butter women imagine that its composition is known only to themselves, and keep it very secret. It frequently enters into the composition of chocolate, and is employed to dye nankeen.
There is a general cessation of labour; the people wander about, indulge in the wildest freaks, address to women who venture out the vilest words, leap and dance as if possessed of the spirit of licence, and throw red colouring-matter on those they meet, without respect of persons; till all seen in the streets, with their besmeared faces and soiled clothes, have a most disreputable appearance.
Tattoo marks may disappear during life; the brighter colours, as vermilion, as a rule, more readily than those made with carbon, as Indian ink; after death the colouring-matter may be found in the proximal glands. With regard to scars and their permanence, it will be remembered that scars occasioned by actual loss of substance, or by wounds healed by granulation, never disappear.
This dark colour of the head, which is sometimes assumed as early as the end of February, comes on very rapidly, not being the effect of moult, but of a change of colour in the feathers themselves, the dark colouring-matter gradually spreading over each feather and supplanting the white of the winter plumage; a few new feathers are also grown at this time to replace any that have been accidentally shed these come in the dark colour.
Blood of different men, of men and women differ. I believe that in time we shall be able to refine this test to tell the exact individual, too. "What is this principle? It is that the hemoglobin or red colouring-matter of the blood forms crystals. That has long been known, but working on this fact Dr.
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