U7 
matters of some vegetables . 
Sulphuric, nitric, and marine acid, made it red. Carbonate 
of lime added to a reddened solution, restored the green 
colour, which therefore appears to be the proper colour of 
the substance. 
The green colour, which the last infusions of galls present, 
appears to be different, both from the usual green of vege- 
tables, and from sap green. 
Some animal greens. 
A green puceron, or aphis, being crushed on white paper, 
emitted a green juice, which was immediately made yellow 
by carbonate of potash (wrongly called sub-carbonate.) 
There are small gnats of a green colour : crushed on 
paper, they make a green stain, which is permanent. Neither 
muriatic acid nor carbonate of soda altered this green colour. 
It is consequently of a different nature from the foregoing. 
