The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . lt.* In healthy urine this acid exists combined with four bases, forming phos-phates of soda, potassa, lime, and magnesia. Of these, the phosphates ofsoda and potassa (alkaline phosphates) are soluble; while the phosphatesof lime and magnesia (earthy phosphates) are insoluble in water, but areheld in solution in urine by the acid phosphate of soda,f in the solutions ofwhich they are f
The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . lt.* In healthy urine this acid exists combined with four bases, forming phos-phates of soda, potassa, lime, and magnesia. Of these, the phosphates ofsoda and potassa (alkaline phosphates) are soluble; while the phosphatesof lime and magnesia (earthy phosphates) are insoluble in water, but areheld in solution in urine by the acid phosphate of soda,f in the solutions ofwhich they are freely soluble. If now the urine be rendered alkaline by anycause, the acid phosphate of soda being neutralized, the earthy phosphatesare no longer held in solution, but are at once precipitated. If the alkalibe a fixed one, as soda or potassa, the precipitate consists of an amorphouspowder merely; but if the alkali be ammonia, it forms with it in neutralizingthe acid phosphate of soda, the four-sided prisms of the ammonio-phos-phate of soda, which, being insoluble, are precipitated, while another portionof the ammonia, combining with the phosphate of magnesia, forms the three- * Thudichum, p. 416. f 608 PRINCIPLES AND PRACTICE OF SURGERY. sided prisms of the aramonio-phosphate of magnesia. The phosphate oflime precipitates as an amorphous powder. These changes, which can readily be produced artificially by the additionof ammonia to urine, occur spontaneously when healthy urine putrefies. Itwas stated, in connection with the etiology of uric acid, that healthy urineundergoes a process of change if allowed to stand, which is designated as theacid fermentation; after the acid fermentation has continued for a periodwhich is shorter in warm than in cold weather, a new process is set up, bywhich, the mucus of the urine acting as a ferment, ammonia is formed at theexpense of the urea, and not merely renders the urine alkaline, but causesa precipitation of the phosphates, as abo
Size: 1530px × 1633px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdec, booksubjectsurgicalproceduresoperative
