Mr. Tay lor discovered a calculus in the collection of the College of Surgeons, pre sumed to be biliary, and composed of the stea rate of lime. It floated in water, and had a lamellar structure ; the lamellm being easily separable and alternately of white and reddish yellow colour. In the centre was a small cavity,. The analysis, justifying the above view of its composition, is given in full. This rare description of calculus appears to signify a stage of transition from the common cases to those instances in which the biliary passages contain masses composed essentially of car bonate and phosphate of lime, especially of the former salt. Richter describes a case in which the liver contained a multitude of such bodies varying in size from a pea to a cherry. Matter of this kind is occasionally found coat ing the gall-bladder and ducts, ; and in the interior of cysts in the substance of the organ. (Baillie and Zannini.) (l.) Pancreatic.— Calculi of the pancreatic duct have been observed in rare instances by Matani, Eller, Biumi, Galeati, and others. Baillie found some as large as a hazel-nut, of white colour and irregular surface, which Wol laston § showed were composed of carbonate of linie.
Fig. 88. represents a portion of a dilated pancreatic duct, which contained an enormous number of small calculi fsuch as are seen within it in the sketch) of dull white colour, perfectly round, varying in size from that of a pin's head to that of a small pea, elastic and hard, Pancreatic calculi have not, as far as we are aware, been found in the intestine in transitu outwards.
(m.) Seminal.— Calculous masses have oc casionally been detected in the vesieulm se minales and ejaculatory ducts.II Collard de
Martigny found some composed of mucus and coagulated albumen chiefly, with a small quan tity of calcareous salts.* These calculi some times accumulate in vast numbers ; thus two Inindred were discovered in the right vesicula seminalis of a man aged forty-five no symp tom had occurred during life connected with the organ.
(n.) Manana2y. — The lactiferous ducts are occasionally the seat of minute calculous bodies ; Gooch, Haller, Reil, and others report cases of the kind. Morgagni alludes to their existence in the breast of a gouty person. The history of the case generally connects their production with the function of suckling, and sometimes with obstruction of the flow of milk.
(o.) Vaginal and pudendal. —Calcareous ac cumulations in these parts are not extremely rare. They originate in a deposition of phos phates around some foreign body; a pessary for example, or around a nucleus of thickened mucus accumulating either from habits of un cleanliness or from malposition of the uterus. Kohler discovered five large chalky-looking masses, weighing together more than seven ounces, in the vagina of a woman, aged forty, affected with prolapsus uteri.
(p.) Uterine. —The internal surface of the uterus is in rare instances found more or less extensively lined with, or studded with rounded masses of, saline matter of variable consistence. This condition has been observed in cases of deviation of axis of the uterus ; the saline znatter is in all probability composed mainly of phosphate and carbonate of lime.