TTL nna 2” einen 
- 
by means of Potassa and Ferrideyanid of Potassium. 365 
mostly of prussiate and sulphate of potash to which no attention 
was paid. Other processes were followed to detect the organic 
substances insoluble in alcohol, which were possibly present. 
A second portion of uric acid was treated as the first, except that 
the solution, which contained principally free potash, —elgscon 
and prussiate of potassa, and the organic bodies in research, 
now neutralized with acetic acid under the precautions before 
or ae On evaporating, a quantity of acetate of ammonia 
as evolved. After the greater part of the prussiate of potash had 
oneimalized, the separated mother liquor was likewise eo 
by alcohol, and then boiled out several times with th eae 
previous essay to separate the prussiate of potash by means of 
acetate of copper, and an excess of the latter by sulphuretted hy- 
drogen, did not furnish a favorable result, because complex decom- 
positions took place, and sulphur entered into the composition of 
the organic bodies. The evaporated alcoholic solution which 
naturally contained a great quantity of acetate of potash, fur- 
nished not a trace of crystals, but only the above mentioned 
viscid syrup, which was separated from the acetate of potash by 
treating with absolute alcohol; this seemed to indicate that the 
first had sustained a further decomposition, by boilingewith ace- 
tate of potassa, which conducts itself in many cases as a feeble 
alkali; the unmistakable development of acetate of ammonia fur- 
nisbed the proof of such decomposition 
The residuary salts, insoluble in alcohol, were then solved in 
water, and the prussiate of potassa precipitated from the hot solu- 
tion by acetate of copper, only very slightly in excess; the filtra- 
ted solution contained, however, neither prussiate ‘potas nor 
copper salts, a proof that the small excess of ne of copper 
was precipitated by the = matter present. This filtrate 
treated with strong alcohol, afforded an abundant crystalline 
white precipitate, soluble in pee and crystallizing im well 
shaped crystals, which on farther investigation, proved to be 
neutral oxalate of potash. "The presence of oxalic acid was fur- 
ther determined by the preparation and an analysis of oxalate of 
lead which furnished 75:16 oxyd of lead 
som purification of the previous mentioned crystalline sub- 
nee was effected very easily by crystallization of the watery 
All these reactions pointed out allantoin, whose presence was per- 
fectly confirmed by analysis 
