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Gall stones, being made not of lime and other similar salts, as are stones in the kidney and bladder, but of cholesterine, are, unfortunately, permeable to these rays; and it is, therefore, doubtful whether the X rays will be of any service to us in determining their presence.
BILE is made up of water, fat, resin, sugar, cholesterine, some fatty acids, and the salts of potash, iron, and soda. THE BRAIN is made up of water, albumen, fat, phosphoric acid, osmazone, and salts. THE LIVER unites water, fat, and albumen, with phosphoric and other acids, and lime, iron, soda, and potash.
It consists, on the average, of about 97 per cent of water and 3 per cent of solids. The solids include bile pigments, bile salts, a substance called cholesterine, and mineral salts. Much about the composition of the bile is not understood. It is known, however, to be necessary to digestion, its chief use being to aid in the digestion and absorption of fats.
The oil appears, from some experiments which I made, to be a mixture of a glycerine salt and a cholesterine salt of fatty acids. It distills without much decomposition, giving a brown-yellow oil, which fluoresces strongly, and has a somewhat pungent smell. The molecular weight was determined by saponification with alcoholic potash, and subsequent titration of the excess of potash employed.
THE LUNGS are formed of two substances: one like gelatine; another of the nature of caseine and albumen, fibrine, cholesterine, iron, water, soda, and various fatty and organic acids. How these varied elements are held together, even science with all its deep searchings has never told. No man, by whatsoever combination of elements, has ever made a living plant, much less a living animal.
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