and some other Animal Fluids. 
Hi 
When corrosive sublimate is added to the solution of the 
colouring matter, its tint is instantaneously brightened, and it 
becomes slightly turbid from the deposition of albumen. If 
this be immediately separated by a filter, the liquor which 
passes through gradually deposits a deep red or purplish in- 
soluble precipitate, and if it now be again filtrated the liquid is 
colourless, the whole of the colouring principle being retained 
in the compound which remains upon the filter. 
By impregnating some pieces of woollen cloth with solution 
of nitrate of mercury, or of corrosive sublimate, and after» 
wards steeping them in an aqueous solution of the colouring 
matter of the blood, I succeeded in giving them a permanent 
red tinge, unalterable by washing with soap ; and by employ- 
ing the ammoniacal solution of the colouring matter, calico and 
linen may be dyed with the same mordant. 
In these experiments I was much satisfied by the complete 
separation of the colouring matter from its solutions, which 
after the process, were perfectly colourless. 
SECTION VII. 
Some Remarks on the preceding experimental Details . 
From the experiments related in the second section of this 
paper, it appears that sulphuric acid effects changes upon the 
coagulum of chyle, similar to those which Mr. Hatchett has 
observed to result from the action of dilute nitric acid upon 
the coagulated white of egg. This last substance, however, 
is not convertible into gelatine by means of sulphuric acid, 
whereas in these respects the curd of milk resembles that of 
chyle : this circumstance, as well as the more ready solubility 
