. Kirkes' handbook of physiology . H18N203, is crystallizable and insoluble in water, and soluble inchloroform or carbon disulphide. A green coloring matter, Biliverdin, C1BH -N204, which always exists in large amount in the bile of Herbivora, is formedfrom bilirubin on exposure to the air, or by subjecting the bile to any otheroxidizing agency, as by adding nitrous acid. Biliverdin is soluble in alcohol,glacial acetic acid, and strong sulphuric acid, but insoluble in water, in chloro-form, and ether. It is usually amorphous, but may sometimes crystallize ingreen rhombic plates. There is a clo
. Kirkes' handbook of physiology . H18N203, is crystallizable and insoluble in water, and soluble inchloroform or carbon disulphide. A green coloring matter, Biliverdin, C1BH -N204, which always exists in large amount in the bile of Herbivora, is formedfrom bilirubin on exposure to the air, or by subjecting the bile to any otheroxidizing agency, as by adding nitrous acid. Biliverdin is soluble in alcohol,glacial acetic acid, and strong sulphuric acid, but insoluble in water, in chloro-form, and ether. It is usually amorphous, but may sometimes crystallize ingreen rhombic plates. There is a close relationship between the coloring matters of the bloodand of the bile, and it may be added, between these and that of the urine, 342 FOOD AND DIGESTION urobilin, and of the feces, stcrcobilin. It is probable they are, all of them,varieties of the same pigment, or derived from the same source. Cholesterin,C,7H45OH, and lecithin, C42Hs4NP09 are constant constituents of bile. Ironis found among the salts of the Fig. 273.—Crystalline Scales of Cholesterin. The Role of Bile in Intestinal Digestion. Though it is not a truedigestive fluid, in that it has no ferment and digests nothing itself, yet it mustbe regarded as an important aid to digestion for the following reasons: (a) Bileassists in emulsifying the fats of the food, and thus renders them capable ofpassing into the lacteals by absorption. For it has appeared in some experi-ments in which the common bile-duct was tied, that, although the processof digestion in the stomach was unaffected, chyle was no longer well formed;the contents of the lacteals consisting of clear, colorless fluid, instead of beingopaque and white, as they ordinarily are after feeding. It is, however, thecombined action of the bile with the pancreatic juice to which the emulsifica-tion is due rather than to that of the bile alone. The bile itself has a veryfeeble emulsifying power. If the theory be accepted that fats are absorbedas fatty acids an
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