49 
“ The following analysis illustrates what has been said above :— 
Se areas 
i — Ae B. (i | D. G. 
Euxanthinie acid - 42°3 70°9 64*3 59°3 33°34 
Euxanthone eL o 12| s8] 74 | sg 
Magnesium "| ^8*88| ^88 | 4:85| -4-60| 3-70 
Caldum - -| r75| 2:43] 261| 338| 8-70 
ZUR dad eeu ooy: ody Ah dedo vta] 
* The euxanthinic acid always oceurs in combination as a salt, and 
the quality A approaches in composition magnesium euxanthinate, 
; Cig Hig Oip Mg T5 H,O. 
_“ This formula corresponds to the following composition :— 
Euxanthinie acid - - - = 78:16 
Magnesium E - 3 i . 
4°57 
- E - 16:67 
“The first scientific researches on Indian Yellow were published in 
1844 by Stenhouse and Erdmann. Since that date it has been re- 
C si H Hg O,. 
2^ eBanheh = quB Or. + Os HOO, 
Glycuronic acid may be considered as a derivative of the group of 
sugars as an oxidation product intermediate between glycose and 
acid. It has not at present been obtained artificially. 
dog, as Kostanecki was the first to do, or to a rabbit according to the 
ssperiments of Kulz, it appears in the urine in the form of euxanthinic 
acid » 3 : $ . i : r ; 
a body 
euxanthone, and this by combining with glycuronie acid produces the 
colourin matter. The nesium which is an essential ingredient in 
Indian ellow either comes from the food of the animal or from water, 
assuming, of course, that in the process of its preparution, the natives 
MISSOURT 
