1835.] on Urine. 13 



0*817. Being mixed with water, the alcohol was distilled 

 off, and the residual liquid dried in vacuo, over sulphuric 

 acid. There remained 61*1 grs. of urea and colouring 

 matter. On the undissolved residue 3 cubic inches of the 

 same alcohol were digested for several days, and then 

 decanted off. It acquired a light shade of greenish-yellow, 

 and the specific gravity had become 0*832. It was found 

 to contain in solution 14*25 grs. of matter; 10*44 grs. of 

 which were salts of urine, and 3*81 grs. urea and colouring 

 matter. 



Thus, the whole urea and colouring matter amounted to 

 64*91 grs. from 23*41 grs. of urine. Hence, 1000 grs. would 

 have yielded 27*6 grs. This is almost 4 grains more than 

 was obtained when nitric acid was employed. The reason 

 of this is that the second specimen of urine had a higher 

 specific gravity than the first. 



The constituents obtained from 1000 grs. of urine of the 

 specific gravity 1*0185, by the preceding analysis, are the 

 following : — grains. 



Phosphate of lime 0*209 



Phosphoric acid ...... 1*131 



Sulphuric acid 0*481 



Chlorine 5*782 



Uric acid . 0*242 



Soda . 4-610 



Potash 2*051 



Ammonia 0*130 



Urea and colouring matter . . 23*640 



38*276 

 It is obvious that the bases and acids in urine are in 

 combination, constituting salts. If we compare the atomic 

 weights of the acids and bases present, it will be found that 

 there is a slight excess of bases. But as, in fact, there is 

 an excess of acid in urine, and as we have shewn it to 

 contain acetic acid, and another volatile acid with a urinous 

 smell, we must add to the constituents obtained as much 

 acetic acid as will saturate the excess. 



I consider the probable saline constituents of urine to be 

 as follows : 



