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Supplementary Sheet. 
DISCOVERY OF THE FLY OF THE WHITE BOT, 
Mentioned at Page 34 5. 
Since the above account was printed, 1 have been successful in obtaining 
from this white larva the perfect fly, which proves a new and hitherto un¬ 
known species. This object 1 accomplished in the following manner.—I 
procured from the slaughter-house a piece of the stomach of a dead horse, 
having a cluster of these white Bots hanging to it, and aware of the diffi¬ 
culty, perhaps impossibility, of nourishing them to their full growth out of 
their natural abode, I rolled them up in the piece of stomach to which they 
were adhering, without detaching them, and forced them with a light hand 
down the throat of my own young horse, who seemed no way incommoded 
by the experiment. The dead portion of stomach would soon be dissolved 
in the juices and actions of the living stomach, and the Bots set at liberty 
would by their hooks take fresh hold, and anchor themselves upon the 
stomach of my own horse.* Transferred to their new residence, I had 
only to wait their full growth and exit to obtain them. About the 20th of 
the 5th month (May) the first made its appearance, falling with the dung 
from the intestines; it was white a little changed to green. By a reward 
offered for each, my groom was mad® quick-sighted, and in this way I se¬ 
cured tw’elve or fourteen more. They continued to come away to the end 
of the month following, and these larva; being placed on some light mould 
in a jar, buried themselves, and in a few days changed to the chrysalis, 
which was dark red in radiating wrinkles; the turns was pierced up open 
at the centre, and depressed: this appearance was from the drying of the 
watery bags covering the air plate probably. 
It is remarkable, that they generally came away from the horse in a 
morning, and not at any other time of the day, uor did they in the least 
adhere to the anus in their exit, as the hsemorrhoidal Bots do. I also 
noticed that they lived in distinct colonies or separate clusters, in the sto- 
- , * 
• I might suggest that by the Mine simple means of translation from the dead to the 
living bowefs of animals, experiments may be made, and the history developed of the Intes» 
tinal worms destroying the animals from time to time, to observe their proceedings (animals 
from the slaughter-house of no value being provided for these experiments,) for worms 
may be administered this way through both mouth and anus. 
