590 PROFESSOR ANDERSON ON THE PRODUCTS OF THE 
as that developed on the wood itself. When agitated with cold dilute acids, pyrrol 
dissolves unchanged, but on heating the solution, it deposits a red flocky sub- 
stance, and if not too dilute, the whole is converted into a gelatinous mass, so that 
the vessel may be inverted without anything escaping. The same change takes 
place in the cold, when the acid solution is kept for some days. When bichloride 
of platinum is added to a cold hydrochloric solution of pyrrol, it instantly becomes 
dark coloured, and in the course of a few minutes an abundant black precipitate, 
containing platinum, is deposited. When boiled with sesquichloride of iron, the 
solution becomes first green, and finally black. Bichromate of potash also de- 
composes it with the formation of an abundant black precipitate, and sulphate 
of copper, when heated with it for some time, acquires a green colour, and a small 
quantity of a black powder is deposited. It is rapidly oxidized by nitric acid, 
with the evolution of abundant red fumes, and formation of a dark-red solution, 
which, when diluted, permits a yellow resin to fall. By long-continued ebullition, 
oxalic acid is produced. An alcoholic solution of pyrrol gives white precipitates 
with corrosive sublimate and chloride of cadmium, but it does not precipitate the 
metallic oxides generally. 
The combustion of pyrrol was very easily effected, and the results are sub- 
joined. The first six analyses were those of crude or fetid pyrrol, and are all from 
different preparations except the first two. The last is that of the fragrant 
pyrrol. 
5°805 grains of pyrrol gave 
I. ¢ 15-250 ... carbonic acid and 
4:070 .-. water. 
3:675 grains of pyrrol gave 
II. 9-625 ... earbonic acid and 
2°550 .». water. 
5'250 grains of pyrrol gave 
III. ¢ 13-830 a0 carbonic acid and 
3675 +». water. 
4:033 grains of pyrrol gave 
IV. < 10:590 ... earbonic acid and 
2-922 ee. water. 
6 Age ee of pyrrol gave 
Vv. carbonic acid and 
Ss eon es Water. 
pe oe grains of pyrrol gave 
VI. carbonic acid and 
water. 
5:213 grains of fragrant pyrrol gave 
VII. ¢ 13°675 ... carbonic acid and 
3°649 «oe Water. 
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