on the Urine of the Camel. 375 
formed, from which I obtained a small portion of benzoic 
acid. 
“ It is somewhat remarkable that no traces of this sub- 
stance should have been discovered in the residuum left after 
distillation ; nor could I by any means observe its presence 
before heat had been employed. 
“ I mention this circumstance, as I think it coincides with 
your opinion respecting the formation of this acid ; and that 
in this case it is not an educt, but a product. 
“ Still I do not see why by a similar process I could obtain 
none from the urine of the camel. 
“ 3. The cow's urine was then examined by the following 
reagents. 
“ Nitrate of silver caused an abundant precipitation of 
muriate of silver. 
“ Barytes was thrown down in the form of sulphat and 
carbonat : the latter in the smallest proportion. 
“ Ammonia indicated the presence of phosphat of lime. 
“ Carbonic acid gas was extricated by muriatic acid. 
“ The results, which I had obtained from the analysis of 
camel’s urine, induced me to imagine that uric acid might 
possibly exist in the urine of other graminivorous animals ; 
and indeed it was a natural conclusion : but I find that it is 
not the case, for in the present experiments I have been 
unable to detect even the least trace of that substance. 
“ The following estimation of the relative proportions of 
the substances present is, I think, as correct as the nature of 
the subject will allow. 
3C 
MDCCCVI. 
