320 
OBSTRUCTION OF 
By chemical analysis horn has been found to consist of mem¬ 
branous substance, having the properties of coagulated albumen, 
and of some gelatine. The horns of some animals, the deer 
species, from containing bone, become exceptions to this. Mr. 
Hatchett burnt five hundred grains of ox’s horn, and the resi¬ 
duum proved only one and a half grain, not half of which was 
phosphate of lime. 
Shavings of hoof thrown into nitric acid become soft, and 
speedily melt into a yellow mass, which in about eight hours 
disappear in complete solution. 
The same thrown into sulphuric acid, turn black, in becoming 
soft, and require thrice the time for their solution. Muriatic acid 
also turns horn black, and corrodes it, but has so little effect 
towards its solution, that after ten days a piece of hoof soaked in 
it was found to have become only more brittle or rotten. Common 
vinegar will turn horn dark-coloured, but does not appear to have 
any power in impairing its texture, or, at least, in dissolving it. 
Liquor potassse will not only turn it black, but will corrode the 
horn of the hoof. Ammonia does not change its colour, but 
slowly destroys its texture, rendering it brittle and rotten. 
titommunication* an& 
Ars veterinaria post medicinam secunda est.— Vkgetius. 
EXTRAVASATION OF BLOOD BETWEEN THE PERI¬ 
TONEAL AND MUSCULAR COATS OF THE JEJU¬ 
NUM, PRODUCING A PERFECT OBSTRUCTION OF 
THE PASSAGE. 
By Mr. George Watts, 2d Dragoons . 
I feel great pleasure in communicating the following account 
of an extraordinary case, which came under my notice a few 
days since. I trust you will give it a place in your truly valuable 
periodical. 
The animal that was attacked with this novel disorder had 
been presented to the regiment to which I am attached by his 
Majesty : he was of the true Hanoverian breed ; he was the most 
restless *horse I ever saw, so much so, that during our last march 
from Brighton to Birmingham, he was not known to walk one 
yard : his bowels, too, were constantly in a state of relaxation. 
