of Cancer , and on Animal Hepatic Air. 29 9 
attraction* This conclufion will be confirmed by experiments 
to be recited in the fequel, which prove, that the volatile alkali 
is capable of entering into a chemical combination with the 
aerial fluid contained in the matter of cancer* 
Of the eitr extricated front cancerous matter , and from other 
animal fubjlances, by d filiation. 
A portionof matter from a cancerous bread was di.fFu.fed through 
diddled water, and introduced into a fmall coated glafs retort, 
which was gradually expofed to heat in a fand bath till the bottom 
oi the retort became red-hot. The neck of the latter was intro- 
duced below an inverted jar filled with water, and a quantity 
of air was received in the jar, which was found to confid of the 
common air contained in the retort. Two meafures of it, 
mixed with one of nitrous air, occupied the fpace of a little 
lefs than two meafures. This portion of air was ftrongly im- 
pregnated with the peculiar fmell of the cancerous matter. 
The heat continuing to increafe, the water began to boil, 
and a large quantity of aqueous vapour a rofe which, as foon 
as it came into contaft with the common air, produced a white 
fmoke. The fmell that was now perceived was remarked by 
thole who Were prefent to be fimilap to that of frefh animal 
fubdances when they are boiled. The aqueous vapour in this 
part of the procels was not mixed with any permanently eladic 
fluid. / 
When the greater part of the water was evaporated, the jar 
containing the fird portion of air was removed, and the neck 
of the retort was introduced beneath an inverted vefl'el filled 
with mercury. Soon after this, a conflderable quantity of air, 
having a fetid imell fimilar to that of burned bones, was extri- 
1 catech 
