DR. KANE ON THE CHEMICAL HISTORY OF ARCHIL AND LITMUS. 
305 
mode by which it is prepared, and it is distinguished by being - coloured pure blue by 
the alkalies, and by containing - nitrogen as a constituent. 
Its analysis was effected as follows : the determination of the azote was effected by 
the same method of relative volumes of the carbonic acid and nitrogen gases employed 
in the other instances. The best precautions were taken to ensure success, and the 
results, though not so uniform as in other instances, owing probably to some irre- 
gularity in the combustion, gave a proportion almost exactly eighteen carbon to one 
of azote. The detail of numbers follows : 
No. of Tube. C Oo + N. 
N. C CL. 
N : CO„. 
A. 128 
7 121 .-. 
1 : 17‘3 
B. 318 
17 301 
1 : 18-3 
C. 196 
11 185 .-. 
1 : 16-8 
D. 528 
28 500 .-. 
GO 
C* 
F— H 
f-H 
The mean result is 1 : 17'6, nearly 1 
: 18, which number I therefore adopt. The re- 
lation of carbon to azote is thus the 
same as in orceine. 
A. 0-307 of substance dried at 2 12' 
3 gave 0-550 of carbonic acid, and 0-148 of water. 
B. 0-376 gramme of another quantity, dried also at 212°, gave 0-683 carbonic acid, 
and 0-187 of water. Hence in 100 parts 
A. 
B. 
Carbon 
49-50 
5005 
Hydrogen .... 
5-35 
5*52 
Oxygen and azote . 
45-15 
44-43 
100-00 
100-00 
The carbon being to the azote as 18 : 1 . there are two formulae which express 
nearly the results of the analyses just described, though the accordance is not satis- 
factory with either formula. These formulae are C 18 H n O n N, and C 18 H 10 O 10 N, 
giving 
1 8 Carbon . 
109-8 
49-3 
18 Carbon . 
109-8 
51*3 
11 Hydrogen 
11-0 
4-9 
10 Hydrogen 
io-o 
4-7 
1 1 Oxygen . 
88-0 4 
45-8 
1 0 Oxygen . 
80-0 4 
44-0 
1 Nitrogen . 
14-1 j 
1 Azote . . 
14-1 J 
222-9 
100-0 
2139 
100-0 
Considering the deviation of the analytical result from the numbers assigned 
by either formula to have arisen from imperfect desiccation, I had another portion 
dried carefully at 230° until no more traces of water were given off, and then it was 
analysed. 
0-432 gramme gave 0783 of carbonic acid, and 0-200 of water. Hence per cent. 
Carbon 49-94 4 
Hydrogen 5T4 tlOO'OO 
Oxygen and nitrogen . . 44’92 J 
2 R 
MDCCCXL. 
