and some other Animal Fluids. 
io, 5 
transparent pellicle upon the evaporating bason, of a dirty red 
colour: this, when redissolved in muriatic acid acquired its 
former tint, but the colour of its aqueous solution was nearer 
brown than red. 
B. Sulphuric acid, diluted with eight or ten parts of water, 
forms an excellent solvent of the colouring principle of the 
blood. 
It may be employed in a more concentrated state; but the 
bright colour of the solution is in that case apt to be impaired, 
and when more largely diluted with water, its action is slow 
and uncertain. Either the sediment of the colouring matter 
from the serum, or the crassamentum of the blood, may be 
indifferently employed in forming these solutions. 
When dilute sulphuric acid is added to the colouring mat- 
ter, it renders it slightly purple ; and if no heat be applied, 
the acid when poured off and filtered, is colourless ; so that 
dilute sulphuric acid when cold, does not dissolve this colour- 
ing principle. 
One part of the crassamentum of blood cut into pieces, was 
put into a matrass placed in a sand heat, with about three parts 
of dilute sulphuric acid. It was kept for twelve hours in a 
temperature never exceeding 212 0 , nor below ioo\ After 
twenty-four hours the acid was filtered off, and it exhibited a 
beautiful bright lilac colour, not very intense, and tainted with 
green when viewed by transmitted light. 
This solution is nearly as permanent as that in the muriatic 
acid. Some of it which has been kept for a month in an open 
vessel, often exposed to the direct rays of the sun, is very 
little altered. 
When diluted with two or three times its bulk of water, 
mdcccxii. P 
