594 PROFESSOR ANDERSON ON THE PRODUCTS OF THE 
close vessels it yields an oil of an extremely offensive odour, and which gives the 
reactions of pyrrol, while a bulky charcoal is left in the retort. In the open air 
it catches fire, and burns readily. When exposed to 212° in the water-bath, it 
gains weight, owing to slow oxidation; and the portion used for analysis was 
therefore dried iz vacuo. The results were— 
16:770  ... carbonic acid and 
6-381 grains of pyrrol red dried in vacuo gave 
4-172 -... . ‘waiter. 
6:440 grains of pyrrol red gave 
0846 =... nitrogen. 
6-910 grains of pyrrol red gave 
III.{ 18:816 ... carbonic acid and 
4172  ... water. 
6-048 grains of pyrrol red gave 
IV.{ 16:054 ... carbonic acid and 
3764 ... . water 
v. { 6578 pans of pyrrol red gave 
nitrogen. 
6: es grains of pyrrol red gave 
VI.< 16-2 ... carbonic acid and 
3 ce a water. 
I, m1, Iv. v. VI. Mean. 
Gavhonn ens saree 71:59 aan 41:77 72-45 one 72:20 71:98 
Hydrogen, . . . 7:29 re 6-70 6°66 es 6°87 6°88 
Mitrogeny.!, «ity Sey psa 13:14 aa ate 14:05 noe 13°58 
Ora gone Babe cy 0) dos S00 eae ane sae Bee 7:56 
100:00 
These results approximate most closely to the formula C,,H,,N,0O2, which 
requires 
24 eq. carbon, 3 - : 144 71-28 
14... hydrogen, . ‘1 f 14 6:93 
2... nitrogen, . 4 : 28 13°86 
2... oxygen, ; ; a 16 7:93 ; 
202 100-00 
It is true that the numbers obtained by analysis do not accord well with this 
formula, and in particular the carbon is materially in excess, but this is undoubt- 
edly due to a further decomposition produced by boiling; for if the heat be con- 
tinued for some time during its preparation, the red matter acquires a dark- 
brown colour, and contains as much as 74 per cent. of carbon. The nature of 
the change by which the red matter is produced is readily intelligible, and is 
thus represented :— 
3 equivalents pyrrol, : 5 j (Gap leis, days 
—1 eq. ammonia, : : H, N 
C,, Hy, N; 
+ 2 eq. water, H, 0, 
1 eq. pyrrol red, . ‘ : ; . C,, H,, N, 0, 
