296 W. Gibbs on Uric Acid. 
The oF en of allantoin from uric acid may be explained 
as follow: 
Rabe 35 N=€—Ho 
v —Ho —t—Ho 
N—O—Ho+0+4H,@ = N—O—Ho 
N— : see 
G<H 
Uric acid. Allantoin 
Here also the action is only exerted upon the glycolic ele- 
ment of the uric acid, since obviou ad 
N=€ 
Sh eee 
In the formation of dialuric acid from uric acid an atom of 
cyanyl also enters into the reaction : 
=€—Ho N=€—Ho 
N60 N—€—Ho 
N—¢—Hoj0H,o = ¢—¢-H 4N=€—Ho 
N—O 6—b-H  H NeH, 
by ue Dialurie acid. Urea. 
Now 
4 pacgi H N=€—Ho) re 
font a, dy. yt Nis and (N= ee 
Lt kt 
In the oxydation of uric acid to form alloxan an atom of cy- 
anyl is involved ; thus 
N=€—Ho N=€—Ho 
Xb ao ‘ N—6—Ho 
N—O=HoHO+H, @ = o—€ +N=€—Ho 
Nv — fot N=H, 
Né—H Alloxan. Urea. 
Here 
, 4 Ho 
y_ 6—0 N= 
© * +8-+H,€ = e—e + Ht N=H, 
In the case of mycomelic acid we have 
ae 
