STOMACH STAGGERS FOLLOWED BY AMAUROSIS. 169 
purgative and tonic, according to the dose in which it is em¬ 
ployed, or tlie state of the animal to which it is administered. 
On the horse it acts essentially as a tonic, and seems to con¬ 
centrate its action on the stomach, the digestive power of which it 
increases. On tire carnivora it produces the same effect, if given 
in small doses, as half a drachm; but if exhibited in larger doses, 
it will produce all the phenomena of purgation; while it may be 
given to the horse and the ox in doses even of six ounces, with¬ 
out producing the slightest purgative effect. It has in very large 
doses given a yellow colour to the urine, and which becomes red 
by the addition of potash. 
I£xtrart0» 
Different Diseases followed or accompanied 
by Amaurosis. 
By M. Hiss. 
[Memoirs of Hie French Royal and Centra! Society of Agriculture.] 
“ Amaurosis (gutta serena),” says M. Samson, “ may be 
either idiopathic , that is to say, depending only on some le¬ 
sion of the retina; symptomatic, when it depends only on some 
alteration of the optic nerve, or of that part of the brain on 
which the vision depends; or sympathetic , that is to say, de¬ 
pendent on organic lesions, which have no connexion by conti¬ 
nuity with the organs of vision.” 
I shall not endeavour to explain the connexion of the following 
different lesions with the functional disorders which they produce; 
that which I now propose to do is to relate some cases which I 
have collected on this subject, and which, I think, will furnish 
important materials towards a history of Amaurosis. 
Stomach Staggers, followed by Amaurosis. 
CASE J. 
September 22, 1824.—A gelding nine or ten years old, in 
tolerably good condition, belonging to M. B., miller, at Saint 
Mihiel. This horse had considerable cough for some time, and 
his master had been advised to give him a quarter of a bushel of 
roasted barley every morning as hot as possible. This food made 
the animal slightly ill the first day that he ate it; but, on the 
second day, the servant having given him a half-bushel, the 
horse, a naturally voracious one, devoured it in a very short time. 
vol. v. a a 
