Dr. Herapatli on the Cinchona Alkaloids. 63 



and give — 



^!|lSO^HO + r)HO=637, 



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

 C W ; 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 eldei'-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 coloxir when analysed with 

 a Nicol'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 quinidine 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 = 27-7410 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 127 = 381 = 50-3301 504096 

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



757 100-000 100-000 



giving— 



C^'H'^N'O^ 

 I^ 



j lSO^HO-h6nO=757, 



which, on comparison with the quinidine salt, will be found to 

 possess 1 atom additional iodine, and 1 atom more water, but a 

 deficiency of 2 atoms oxygen, the latter, apparently, in consequence 

 of the original difference in the type of the alkaloids employed ; and, 

 like that salt, it differs in its organic base by the loss of C^ 11' from 



