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THE BOT OF THE HORSE. 
region, on those of the shoulders and flanks of the solipede ; 
the larvae are immediately hatched, produce an insupportable 
worrying itching ; the animal, to relieve himself, licks or bites 
himself with his nippers ; at which times the larvae cling to 
the tongue or the lips, and being swallowed, proceed to stick 
upon, first the oesophagus, and then the stomach. 
2. SALUTARY BOT. 
(C Estrus Salutaris , Clark ; Gastrus Salutaris, Meigen.) 
Existing in solipedes in a state of freedom, in autumn, in 
England. The English veterinarian, Bracy Clark, is of 
opinion that the larvae of this diptera, which inhabits the 
stomach of the horse, promote digestion. It is readily seen, 
however, how arbitrary this assertion is, whether he ascribes 
such a property to a new species different from the original, 
or whether it be one which has no existence ; there being all 
the difference between doing no harm in small numbers, 
which is common to the other species, and being useful. 
3. HEMORRHOIDAL BOT. 
((Estrus Hemorrhoidal is, Linn. ; Gastrus Hemorrhoidalis, Meigen.) 
To be found throughout Europe. 
The female deposits her eggs in the vicinity of or within 
the nose of the horse ; and through being licked they be- 
come transported into the intestinal tube, wherein they are 
hatched. But, as we shall see by-and-by, it is still the 
original species depositing her eggs, through forced circum- 
stances, at one time upon the nose, at another upon the com- 
missures of the lips, or upon the cheeks; and such naturalists 
as have maintained the contrary have not correctly observed 
the habits of the insect. Bracy Clark does not admit this 
species ; but he describes the following one, which, as may 
be seen by its characters, is still identical w 7 ith the first or 
original one. 
4. — NASAL BOT. 
The larva of this bot inhabits the oesophagus of solipedes. 
And these constitute the several species described by the 
authors we have cited as being proper to Europe, with the 
exception of a fifth species, described by Brongniart, under 
the name of oestrus Jlavipes ; a bot with pale yellow feet, 
smoother than any of the others, which he had found in the 
Pyrenees, without learning anything about its habits. From 
the characters of the first four species, it will appear evident 
from the grub, lest their progeny be lost, that it is not upon 
