19 



and give 



p35 TT19 VT2 f)4 



which differs from Gerhardt's formula for quinidin by the loss of 

 C 5 H 5 ; but at this stage of the question it is scarcely possible to 

 arrive at a solution of the manner in which it is produced. 



The cinchonine salt differs much from all those previously de- 

 scribed ; it exists in long, acicular, quadrilateral prisms, of a deep 

 purplish-black colour, like that of elder-berries. 



Thin crystals transmit a yellow tint pure gamboge-yellow when 

 very thin ; soon passing through a deep sherry-brown to a blood- 

 red colour, then a deep port-wine colour, and then becoming 

 opaque. 



These crystals reflect a deep steel-blue colour when analysed with 

 a Nichol's prism, and generally across the short diameter of the 

 prism, which is the analogue of the a-prism of the quinine salt. The 

 cinchonine salt possesses doubly absorbent powers, much more power- 

 fully so than the quinidin salt, but inferior to all the others ; the 

 body-colour is deep sienna or bistre-brown. 



This salt furnished the following analytical results : 

 I. II. III. 



Iodine ........ 50*34 50-587 50-302 



Sulphuric acid . . 5-247 5-217 



Carbon ........ 28-156 27'57 27'37 



Hydrogen ...... 3-523 3-485 3-454 



Nitrogen ...... 3-306 



which lead to the following composition : 



Theory. Experiment. 



35 Carbon x 6 = 210 = 277410 27'698 



26 Hydrogen x 1 = 26 = 3-4346 3'487 



2 Nitrogen x 14 = 28 = 3'7000 3-306 

 9 Oxygen x 8 = 72 = 9'5103 9'8674 



3 Iodine x!27 = 381 = 50-3301 50-4096 

 1 Sulph. acid = 40 = 5-2840 5-232 



757 100-000 100-000 



giving 



Q3.5JJ19 ^ 



c2 



