| Water | 5.4 |
| Solids | 94.6 |
The contents of the solids are—
| Bile-pigment | 84.2 |
| Cholesterin | 0.6 |
| Salts (iron, potash, soda) | 15.2 |
153 The Diseases of the Liver, with and without Jaundice, etc., by George Harley, M.D., F.R.S., Philada., 1883, p. 349.
Some years ago, before I was aware of the nature of such concretions. I detected a number in examining the stools of a patient who had in quick succession many attacks of hepatic colic, but as the usual form of concretion was looked for and not found, the relation of these bodies to the symptoms in the case was not understood. I now recognize the value of Harley's observations on these bodies.
The biliary concretion which is properly a gall-stone has a definite form and a more or less well-defined crystalline structure. The forms taken are various. The most usual form is octagonal or hexagonal or polyangular, with smooth facets, corresponding to points of contact of other calculi. Instead of smooth facets and sharp angles, the concretion may be studded with irregularly-shaped masses. When there are numerous calculi present, they have smooth surfaces and rather sharp angles, made, not by attrition, as has been supposed, but by deposition of the new material under pressure. When they have this form there are many present, but the number of facets does not indicate the number of calculi, and the absence of facets is not proof of the absence of other calculi. The smooth opposing surfaces are not always plane, but may be convex or concave to fit the shape of the adjacent bodies.
Calculi may be globular, ovoid, cylindrical, and truncated cones. The largest in my collection is egg-shaped, and nearly filled the gall-bladder which contained it, a little mucus free from bile-elements only being present. If a concretion forms in a duct or a single one is present in the gall-bladder, the shape is determined by the pressure of the walls of the duct or of the gall-bladder, respectively. As found in the stools, and still somewhat soft, the shape will represent the form of the common duct through which it has been pressed. Such a soft, recently-formed gall-stone will have the crystalline structure and chemical constitution of these bodies, and will therefore differ from, apparently, similar masses of inspissated bile. Although a round, ovoid, or cylindrical calculus indicates the absence of others because there are no evidences of mutual pressure and adaptation, a positive conclusion cannot be reached in that way, for the gall-bladder may contain numerous calculi of long-standing, and a recent concretion formed in a duct be discharged with the usual symptoms.
The number of calculi which may be present at any time or be produced in the course of years ranges from one to several thousand. The number is in inverse ratio to the size. One case154 is reported in which 7802 calculi were found in the gall-bladder, but they must have been very minute in size. Of the specimens now in my collection, there are 230 obtained from one gall-bladder, which they entirely filled; they are nearly uniform in size, have an average weight of two grains, and contain four, five, and six smooth facets. Another collection of calculi removed from a closed gall-bladder contains 45, of large size, distending the organ and forming a tumor which projected beyond the margin of the liver. Hepatic calculi are rarely solitary; hence if one attack of hepatic colic occur, others may be expected.
154 Frerichs, op. cit., vol. ii. p. 499.
In color gall-stones vary from a clear white to a dark-brown, almost black, tint. The most usual tint of the mature calculi in the gall-bladder is that of the ripe chestnut. Long stay in the intestines increases the depth of the color, until it becomes almost black; on the other hand, detention in the gall-bladder has a slightly bleaching action; but the real cause of difference of color is the presence or absence of pigment. If composed of pure cholesterin, the color will be whitish, opaque, or glistening and almost translucent.