103 



and that it cannot be discovered in the blood* 

 1 have had an opportunity of examining" diabetic 

 urine, in which no sugar could be discovered, 

 and in which, nevertheless, no urea was fouud. 

 When alcohol was poured on this urine, when it 

 had been gently evaporated, it dissolved a brown 

 substance, which, after the alcohol was evapo- 

 rated by heat, left a quantity of stiff extract, in 

 which lactic acid was discovered, and together 

 with it some signs of lactate and muriate of ammo- 

 nia; the extract, however, consisted almost en- 

 tirely of the animal matter, which accompanies 

 the lactates, it was precipitated by tanning matter, 

 and left after combustion a small quantity of mu- 

 riate of soda, which had some slight traces of a 

 free alkali. 



The urine of various kinds of animals has been 

 examined by ROUELLE, FOURCROY, VAUQUE- 

 ULN, BRANDE, CHEVREUJL, &c. and to these 

 experiments may also be added the analyses 

 made by FOURCROY, VAUUUELIN and KLA- 

 PROTH, of a collection of the excrements of a 

 bird from the South sea, called Guano, in which 

 they found a great quantity of uric acid, BRANDE 

 thinks, that he has discovered the same in the 

 urine of the camel, and YAUQFEUN found it in 



