212 NOTES ON THE IDENTIFICATION 



and in stellate groups, some of which exhibit a black cross on 

 a white ground, resembling somewhat the grains of tous-les- 

 mois ; the larger groups show some colour (Fig. 2). 



CiNCHONiDiNE SuLPHATE exhibits a marked change into pure 



colourless feathery sprays (Fig. 4). 

 CiNCHONiNE. — The crystals of this alkaloid, deposited from 



alcohol, are small, and resemble those of caffeine. The 



arrangement is, however, different. They are grouped in 



stars. 



Opium. 



Morphine crystallised from alcohol in minute needles (trimetric). 

 They are characteristic and ?>ho\\ faint colouration (Fig. 5). 



Meconic Acid forms micaceous scales or small rhombic prisms, 

 and is a unique object ; the most usual form is a square with 

 elongated corners, thus producing curved sides. The colour- 

 ation is very varied : one may be like the French tricolor, 

 another quartered, another showing two hues parted by a 

 median line (Fig. 6). 



Meconine crystallises from water in a network of long needles, 

 which are very large and of all conceivable colours (according 

 to Watts, they are hexagonal prisms) (Fig. 9). 



Narcotine separates from alcohol in separate crystals, each an 

 independent hue (Fig. 7). 



Codeine crystaUises from alcohol in large rectangular octohedra, 

 truncated and modified in various ways. Also in a network 

 of prisms, and other modifications. The selenite makes very 

 little difference to the large crystals, as they are too thick to 

 be affected by it (Fig. 8). 



Papaverine. — The crystals deposited from alcohol have a great 

 tendency to arrange themselves in globular stars. Between 

 these are seen badly-formed prisms, generally four or five 

 together, star-wise. They are coloured (Fig. 10). 



Thebaine. — The crystals are very similar to those of elaterine, 

 but are larger and better defined. They are square plates, 

 and show no colour without the selenite (Fig. 11). 



Narceine forms stellate groups of needles, which require the 



