Professor Dana on Morbid Animal Products. 153 
Fibrina. They have a great resemblance to the Fibrinows 
caleult of Dr. Marcer 
3. Examination of some concretions found in a box labelled 
ae from a Bullock’s Tongue,” in the Nichols col- 
lect 
The colour of these concretions is black internally, ex- 
ternally brown ; compact radiated fibrous ee ebm with a 
silky lustre ; soft; do not sink in water. 
1. Water boiled on cle acquires a yellowish tinge, and 
frothed much during ebullition. Tincture of galls produced 
no bye ens: in this watery solution. 
. Nitric acid acquired a sich violet iibuis and the black 
orl ‘of the concretions assumed the same hue ; the col- 
our vanishes when the acid is exposed to heat ; at the boil- 
ing temperature of the acid the concretions melted, and on 
cooling, they congealed into spherical masses of a yellow 
colour, which were easily rubbed to a fine powder between 
the fin 
3. These yellow globules were soluble in solution of 
adits by the aid of heat; of cooling the greatest part sep- 
arated, _ te Ch nti, 9 <3 ‘appeared on the addition of acids 
to bt 
en readily solu ible in boing alkohol the al- 
kohal aequeed's a yellow colour, and on cooling, oe 
brilliant white crystals. 
5. Exposed to destructive distillation, a white vigdd ise 
from them which condensed into an amber coloured pr oer 
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 
hele which contained them had not been labelled as above, 
we should pronounce them 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 former j ig of an oval shape, tte latter like 
a flattened pear. | 
Von. IV.....No. 1. 20 
