. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PRODUCTS, ADVENTITIOUS. 75 1. When the materials forming them are crys- of any one of the more important materials ta/linc, minute crystals, the basis of the future (with perhaps a single exception) detected in urinary calculi; of these uric acid and oxalate of lime are the most common, while the phos- calculus, go on increasing in number, though not individually in size, and by their accretion, depending upon mutual attraction, form masses, phate of lime and triple phosphate hold the opposite position in the scale. A la
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PRODUCTS, ADVENTITIOUS. 75 1. When the materials forming them are crys- of any one of the more important materials ta/linc, minute crystals, the basis of the future (with perhaps a single exception) detected in urinary calculi; of these uric acid and oxalate of lime are the most common, while the phos- calculus, go on increasing in number, though not individually in size, and by their accretion, depending upon mutual attraction, form masses, phate of lime and triple phosphate hold the opposite position in the scale. A law esta- blished by Dr. Prout, that " a decided deposi- tion of the mixed phosphates is not followed by other depositions," is, with few exceptions, universal. Cystin has not (as far as we are aware) been found playing the part of a nu- cleus in any recorded case; to this statement a large calculus of cystin surrounded with a very thin coating of phosphates (Univ. Coll. Museum) cannot fairly be considered to sup- ply an exception. A calculus commonly contains a single nu- Animal matter may aid in cementing together the constituent parts, but in this form of coales- cence its occurrence to any amount is acci- dental, and tends rather to diminish the firm- ness of union. Pure uric acid calculi are formed on this model. 2. When the substance form- ing calculi is primitively amorphous, no attrac- tion exists between the minute particles form- ing the deposit ; hence a medium of union or cement is necessary. This is furnished by animal matters secreted with the urine, or thrown out by the surfaces along which it. passes. The quantity and quality of these cleus only ; but instances are not wanting of matters being liable to vary, the general aspect calculi containing two, three, and more nuclei, of the resulting calculus, and its properties of Masses of the latter kind are probably simply density, &c., must be subject to similar variety, aggregations of smaller ones, as
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