22i' 



237 100.00 



On adding an alcoholic solution of chrysorhamnine to a 



solution of acetate of lead, a rich yellow precipitate is 



formed, which, when dried at 212°, was found to be expressed 



by the formula C23 Hi, On + 2 PbO, the numbers being as 



follow : 



Theory. Experiment. 



Carbon .... 138.0 29.98 . . . 29.62 



Hydrogen ... ll.O 2.39 . . . 2.19 



Oxygen. . . . 88.0 19.11 . . . 19.59 



Oxide of lead. . 223.4 48.52 . . . 48.60 



460.4 100.00 100.00 



A little water appears to have been lost in the analysis, 

 which, however, does not affect the formula deduced. 



By the decomposition of a more basic acetate of lead, a 

 yellow precipitate is obtained, which consisted of one equi- 

 valent of chrysorhamnine united to three equivalents of oxide 

 of lead. 



The chrysorhamnine may be easily observed in its na- 

 tural state of deposition in the berry ; it hues the interior of 

 the capsule-cells, with a brilliant resinous-looking pale yel- 

 low, and semitransparent coating. 



Xanlhorhamnine is formed by boiling chrysorhamnine in 

 water, in a capsule, so as to admit of free access of air. It 

 dissolves with an olive, yellow colour, and on evaporating to 

 dryness, remains as a dark, extractive looking mass, quite in- 

 soluble in ether, but abundantly soluble in alcohol and water. 

 It may be procured also from the berries, without previous 

 separation of the chrysorhamnine, by similar treatment, but 

 it is then rendered impure by a gummy substance being 



