Mr. Venables on Siliceous Gravel 241 



It reddened litmus paper, had a specific gravity of 1.026, and 

 contained a considerable excess of urea. 



The second specimen passed the following morning before 

 breakfast, looked clear and almost like spring water ; had 

 scarcely any smell or taste ; sp. gr. 1*02, faintly reddened 

 litmus paper, and contained a very slight excess of urea. 

 After standing, a greasy-looking crystalline film floated on 

 the surface, which consisted, principally, of the triple phos- 

 phate, with a little muco-purulent matter. They were both 

 serous. 



I examined this woman's urine again on the 27th of 

 August, 1829. It was turbid, opalescent, from the suspension 

 of a large proportion of muco-purulent matter with the lithates 

 of ammonia and lime, and which were of a whitish-yellow 

 colour. There was also a small quantity of the fusible phos- 

 phates. It faintly reddened litmus, and the sp. gr. was T025. 

 There was a great excess of urea, and it was serous. This 

 unfortunate woman has very bad health, is very frequently 

 attacked with severe illness, and has lately voided blood with 

 the urine. She has not, so far as I know, passed any more 

 gravel or calculi. 



The second case, the general symptoms of which have been 

 already stated, and, in many points, are analogous to those of 

 the first, consulted me on the 22d of October, 1829. 



The specimen of urine which she brought was turbid and 

 opalescent. On being set aside, it became clear and trans- 

 parent by the slow subsidence of purulent matter, mixed with 

 the alkaline lithates, of a pale red colour. It was neutral or 

 rather alkalescent, of a deep amber colour, serous, sp. gr. 

 1*020 ; no excess of urea ; siliceous sand at the bottom of 

 the cup. 



28th. Siliceous deposit in very small quantity, but sufficient 

 to distinguish it. The urine turbid from the muco-purulent 

 matter, which, subsiding, the urine became clear, transparent, 

 and of an orange colour. It was neutral, serous, sp. gr. 1.022 ; 

 no excess of urea. 



29th. Urine turbid as before, and exhibits the same general 

 properties, reddens litmus, and contains rather more lithic 

 acid; serous, sp. gr. 1.024; slight excess of urea: quantity 

 of siliceous sand increased. 



