Elements of pathological anatomy . l smell when heated with caustic potash, and deflagrates AMMOXIACO-MAGNESIAN PHOSPHATES. 719 remarkably below the blow-pipe. This variety of calculous concretion wasfirst described by Fourcroy. Next to the uric calculus, in point of frequency, is the oxalic, which isgenerally of a dark brown color, rough and tuberculated on the surface, veryhard, compact, and imperfectly laminated, seldom larger than a walnut, sphe-rical, and always single. Under the blow-pipe, it expands and efflorescesinto a white powder ; it dissolves slowly in muriatic and nitric acid, pr
Elements of pathological anatomy . l smell when heated with caustic potash, and deflagrates AMMOXIACO-MAGNESIAN PHOSPHATES. 719 remarkably below the blow-pipe. This variety of calculous concretion wasfirst described by Fourcroy. Next to the uric calculus, in point of frequency, is the oxalic, which isgenerally of a dark brown color, rough and tuberculated on the surface, veryhard, compact, and imperfectly laminated, seldom larger than a walnut, sphe-rical, and always single. Under the blow-pipe, it expands and efflorescesinto a white powder ; it dissolves slowly in muriatic and nitric acid, pro-vided it be previously well broken up. In the alkalies, it is perfectly in-soluble. This species of urinary concretion, called by many the mulberrycalculus, from its resemblance to the fruit of the mulberry, was first cor-rectly analyzed, in 1797, by Dr. Wollaston, who proved it to consist essen-tially of oxalate of lime. Figs. 195 and 196 show the external appearanceand internal structure of this concretion. Fig. 195. Fig.
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