430 H. B. Hill—Ethers of Urie Acid. 
water than. the eae ether, it may readily be removed 
by reerystallizatio 
Methylurie sitid “oryetallines in small clear flat prisms, appar- 
ently of the trimetric system, the crystals being often pointed 
at either end. By slow cooling of a dilute solution, these crys: 
tals sometimes reach a lengt of 2-3 mm., but they are usually 
much smaller. The substance undergoes no visible change 
when heated to about 300°; at a higher temperature, it melts 
with complete decomposition, and without perceptible subli- 
tion. It is soluble in boiling water, almost insoluble in 
cold water or in boiling aleohol; insoluble in ether. Co 
concentrated sulphuric acid dissolves ie foster | upon 
dilution it crystallizes out, apparently 
The substance dried at 165° has the lahat o 5 H(CH ) N,Os, 
as the following analyses show: 
1. 04284 grm. gave 0°1310 grm. H,O, and 0°6210 grm. CO,. 
2. 0°2748 orm. gave 0°0985 grm. m. H, O,a nd 0°3972 grm. CO,. 
3. 0°1822 grm. gave 50°0 c.c. nitrogen, at 20°°5, and 754°3 mm, press. 
Calculated for Found. 
C,H,N,03. 1 2 3 
C 39°56 39°53 39°43 
H 3°30 3°3 3°98 
N 30°77 30°98 
As the mean of several determinations of solubility, I find 
poe there are required for the solution of one part of methyluric 
cid 253°6 parts of boiling water, and 4596 parts of water at 
The aqueous solution reddens litmus feebly, and decom- 
poses carbonates readily on heating. A solution in potassic or 
sodie hydrate is not precipitated by carbonic dioxide. From a 
concentrated cold solution, stronger acids ome it gela- 
some of which have been studied by Mr. O. R. Jackson In this 
laboratory. The results of this investigation may be foun in 
the Proceedings of the American Academy.* He has analyzed 
the following salts: 
K,C,H(CH,)N,0, 3 
KC,H,(CH,)N,O, 
“H(CH,)N, 
Ba(G, H(CHN, 6,)o4 
Ca(C. H(CH,)N,0O,), 3 H,O 
These salts show that the monomethyl ether of uric acid is 
* Amer. Acad. Proc., xii, 36. 
