147 
a large crop of crystals in the following way. It was dissolved 
in hot chloroform and alcohol added and the whole heated on the 
water bath; as soon as a sufficient quantity of chloroform distilled 
off there appeared in the solution glittering crystals. At this point 
the heating was interrupted and the solution left to crystallize. In 
a few hours a mass of well developed rhomboides and rhombs is 
formed, which examined under the mieroseop did not appear quite 
homogenous: amongst the erystals we notieed brown amorphous 
masses. In order to get bixin quite free from any amorphous ad- 
mixtures we repeated the crystallisation from a mixture of chlo- 
roform and aleohol several times. The erystallisation from boiling 
glacial acetie acid leads also to a perfeet product. 
Crystallized bixin represents when the crystals are small a 
bright red mass; in case the erystals are larger a brown red mass 
not unlike amorphous phosphorous. It melts when heated quickly 
at 198°, slower at 191-50. The crystals examined under the mieroseop 
possess the following forms: 
Pure bixin is but little soluble in cold chloroform, 100 g of 
the latter dissolve at 250 only 0:34 g of bixin. In alcohol, ether 
or glacial acetic acid it dissolves still less. Boiling glacial acetie 
acid takes it up readily. The best solvent is pyridine, next follows 
quinoline; boiling nitrobenzene dissolves it easily. 
We made a great number of analysis of various preparations. 
Some of them may be quoted here: 
1) 01195 g gave 03269 &-CO, and 0:0839 g H,O 
LOMME 0A, ta. 008125, 
3)2.012008,7 7,7. 0327182, 
1 
PTE IE 
