FLUID EFFUSED IN PLEURISY IN HORSES. 
122 
colic ; we may be almost certain that he has one or more stones 
in the bladder or canal of the urethra. Nothing further remains 
but to clear up these suspicions, and to operate, following the 
examples I have set forth or such as have been offered here¬ 
tofore, according to circumstances. 
ANALYSIS OF THE FLUID EFFUSED IN PLEURISY 
IN HORSES. 
By M. J. L. Lassaigne. 
Uf. Colour, yellow; taste, saline; very viscous, froths when 
agitated and mixes readily with water. 
2dly. It restores the blue to turmeric paper reddened by an 
acid. Nitric acid immediately precipitates large white flakes 
from it; infusion of galls throws down a copious, yellow, fleecy 
precipitate. 
ddly. By heat it coagulates in yellow flakes and turns to a 
mass resembling the white of egg; silver immersed in this co- 
agulable fluid while hot is withdrawn blackened : which is 
similar to what happens with white of egg, and is owing to the 
presence of sulphur. 
'\thly. The coagulated substance has a yellow colour, which 
alcohol deprives it of, and which, separated from the animal mat¬ 
ter, is soluble both in water and spirit. The animal or albuminous 
substance, calcined in an earthen crucible, yields an ash from 
which is ex'tractible a small quantity of phosphate of lime, as 
shown by its effervescence with weak nitric acid. 
bthly. The uncoagulated part of this fluid, evaporated to dry¬ 
ness, yields a yellowish white alcaline extract, possessing a 
highly saline flavour. It contains a small portion of albumen, 
held in solution by the alkali present. The product of its cal¬ 
cination furnished, on being washed, sub-carbonate of soda, 
muriate of soda, a little sulphate of soda and muriate of potash : 
but no trace whatever of any soluble phosphate. 
The conclusion deducible from these experiments is that this 
fluid bears the greatest analogy to the serum of the blood, both 
in regard to its physical properties and chemical composition ; 
and that it consists principally of albumen and water, pervaded 
by a yellow colouring matter, and impregnated with all those 
salts detectable in the blood. 
