Professor Dana on Morbid Animal Products. 153 
Fibrina. They have a great resemblance to the Fibrinous 
caleult of Dr. Marcer. 
3. Examination of some concretions found in a box labelled 
“ Stones from a Bullock’s Tongue,” in te Nichols col- 
lection. 
The colour of these concretions is black internally, ex- 
ternally brown ; compact radiated fibrous structure, with a 
silky lustre ; soft ; do not sink in water. 
1. Water boiled on them acquires a yellowish tinge, and 
frothed much during ebullition. ‘Tincture of galls produced 
no precipitate in this watery solution. 
2. Nitric acid acquired a rich violet colour, and the black 
portions of the concretions assumed the same hue; the col- 
our vanishes when the acid is exposed to heat ; at the boil- 
‘mg temperature of the acid the coneretions melted, and on 
cooling, they congealed into spherical masses of a yellow 
colour, which were easily rubbed to a fine powder between 
the fingers. 
3. These yellow globules were soluble in solution of 
potash by the aid of heat; on cooling the greatest part sep- 
arated, and no precipitate appeared on the addition of acids 
to the potash. 
4. They were readily soluble in boiling alkohol; the al- 
kohol acquired a yellow colour, and on cooling, deposited 
brilliant white crystals. 
5. Exposed to destructive distillation, a white vapour rose 
from them which condensed into an amber coloured oil, and 
became a soft solid when cold. A small quantity of char- 
coal remains, which is spongy and brilliant; ammonia could 
not be detected in the products of distillation. 
These concretions are similar to Gall stones; and if the 
box which contained them had not been labelled as above, 
we should pronounce theny Gall stones. 
4, Two very large calculi composed of carbonate of lime 
are in this collection, and supposed to have been taken from 
horses. One of them weighs 15 oz. 3 drams, the other 1 lb. 
9 oz. 3 drams, the fonceer is of an oval shape, the latter like 
a flattened pear. ‘ 
VouwlV..c.:Nos 1. 20° 
