128 MR. E. SCHUNCK ON A COLOURING MATTER 
washed with cold alcohol, and dried over sulphuric acid. 
It yielded on being analysed the following results : — 
0:9555 grm. gave 1:1315 grm. carbonic acid and 0°3090 
water. 
0:7630 grm. gave 0°4025 grm. sulphate of lead. 
From these numbers may be deduced the following 
composition : — 
Equivs. Calculated. Found. 
Carbongys. is: %3 2 ss) a0 er 180 31°83 32°29 
Hydrogen .......... 18 18 3°18 3°59 
Oxygen .. sees 18 144. 25-48 25°31 
Oxide of Lead...... 2 223°4 39°51 38°81 
565°4 100:00 100:00 
If the formula of the lead compound is Cy) Hyg Oy + 
2 Pb O, as the above analysis seems to indicate, then that of 
the substance in its uncombined state must be Cy) Hy Ox 
and its theoretical composition will be as follows : — 
Equivs. 
Carbon’... :..wexbies 30 180 50-00 
Hydrogen......... 20 20 5°55 
WOXVSER 2. .ctscetes 20 160 44°45 
860 100:00 
A comparison of the properties and composition of this 
substance with those of Rutine or Rutic Acid, the colouring 
matter discovered by Weiss* in the Ruta graveolens or 
common rue, and by Rochleder and Hlasiwetz+ in capers, 
leads to the conclusion that they are identical. A colouring 
matter, having the same properties and composition, and 
being apparently the same substance, has also lately been 
* Pharmaceut. Centralblatt, 1842, s. 903. 
+ Annalen d. Chemie u. Pharm., Bd. LIII. s. 385. 
