280 DR. KANE ON THE CHEMICAL HISTORY OF ARCHIL AND LITMUS. 
From these results, the numbers which follow, and to which I will annex the result 
obtained by Liebig, with the specimen of pseudo- 
erythrine sent to him by Heeren, 
are deducible, and they point to the very simple 
formula C 5 H 3 0 2 , the calculated 
results of which are likewise added. 
Experiment. A. 
B. 
Liebig. 
Carbon . . 61*19 
61*16 
60*810'j 
Hydrogen . 6*20 
6*31 
6*334 L 100*00 
Oxygen . . 32*61 
32*53 
32*856J 
The theoretical numbers being, 
5 Carbon . . 
30*5 
61*73 
3 Hydrogen 
3*0 
6*04 
2 Oxygen . . 
16*0 
32*23 
49*5 
100*00 
The formula deduced by Liebig was almost identical, it being C 20 H 125 0 8 . 
The compound of erythrine with oxide of lead was found to give the followingresults. 
A. 0*970 gramme gave 0T52 gramme of oxide of lead, and 0*585 gramme of metal- 
lic lead. 
B. 1*088 gramme gave 0*468 gramme of carbonic acid, and 0*129 gramme of water. 
The simplest formula expressing these results, is C 5 H 3 0 2 -f- 2 PbO, which gives 
Theory. 
Experiment. 
5 atoms Carbon . . 
30*5 
11*18 
11*89 
3 atoms Hydrogen 
3*0 
1*10 
1*32 
2 atoms Oxygen . . 
16*0 
5*87 
6*20 
2 atoms Oxide of lead 
223*2 
81*85 
80*59 
272*7 
100*00 
100*00 
The quantity of oxide of lead in this analysis varies more from the calculated result 
than in other cases it was found to do, the quantity of oxide of lead being generally 
between 81 and 82 per cent. The specimen analysed was prepared with as little 
alkali as possible, and hence probably a small quantity of erythrine in excess at onee 
gave too high a value for the constituents of the organic element, and reduced the 
oxide of lead below the proper amount. 
Although the very simple formula C 5 H 3 0 2 , expresses so accurately the constitu- 
tion of erythrine in its free as in its combined condition, yet some consideration is 
necessary before finally adopting it. The erythrine, as proved as well by the experi- 
ments of Heeren as by my own, is but one member of a series of bodies arising from 
the erythryline, and hence there must be established formulae, not merely exhibiting 
the numerical results of analysis, but also displaying the manner in which these bodies 
are produced, one from the other, before their history can be considered as complete. 
If we compare therefore the formulae of erythryline and of erythrine as just now given, 
