PARASITES OF THE ALIMENTARY TRACT 59 
into England. It is of a dark red blood tint. The 
colour is densest at the head, while at the tail end it is 
much lighter. 
In Australia Gastrophilus nasalis is common, and it 
is occasionally seen in England. The bot attaches itself 
to the pyloric end of the stomach and to the duodenum. 
It is frequently found in the pharynx and cesophagus, 
causing dyspnoea and coughing. 
Symptoms.—As a general rule, bots cause little or 
no disturbance. Occasionally chronic indigestion may 
result, and this may be associated with ulceration or 
perforation of the stomach wall. Colic occasionally 
results from their presence, and spasm of the cesophagus, 
associated with retro-peristalsis, has been noticed when 
bots have been present in sufficient number to cause 
obstruction. 
Treatment.—Owing to their great vitality, it is prac- 
tically impossible to introduce medicinal agents into the 
stomach in sufficient concentration to destroy the bots. 
In the spring they leave the horse, and should then be 
destroyed, in order to prevent increase in the number 
of bot-flies in the succeeding year. 
The following prescriptions are in common use: 
BR Creolin ws or 4 .. Bij. 
Ol. tereb. oe #4 os ..  5y-ss. 
OL lini .. as ic AP .. ad OQj. 
M. Fiat haust. 
R Carbon disulphide .. : 3ss. 
This is best given in a eapaile: 
BR Benzene 23 ie a sa Be 
Tinct. iodi. .. $8 at .. 58s. 
OL lini.. Se Ais ins .. ad O,j. 
M. Fiat haust. 
B Creosote des es o se Bi. 
Chloroformi .. Ze ree .. Bij. 
Ol.{tereb. a ae ae ..  3Bj.ss. 
Ol. lini .. ae a ae vs Ode 
M. Fiat' haust. 
