6                                          Surra.

I found was apparently a non-blood sucker, and at this time
the blood-marks were much less numerous than in September.
The ponies that were rugged up at night did not show so many
blood-marks as those in the segregation shed which were not
rugged up, but the segregation shed was situated on the edge
of thick jungle.

The cessation of the outbreak corresponds with the dimi-
nution in number of these blood-marks, and also with the
diminution in number of Stomoxys. In September, however,
the Stomoxys was found at every stage on the road.

The only two cases that occurred at Dogaon and Amprao
are probably accounted for by their recent transfer from Bojia-
ghat, and they may also have been overlooked for some days
owing to the irregular testing which was carried out at the two
former stages. At Amprao, the syces had not seen the blood-
marks ; at Dogaon, they had, but my own night visits to these
places were made too late to be able to entirely confirm either
statement, and I can only say that on 15th October there
were no such marks at night at either stage.

The reappearance of the disease with the use of the old
Bojiaghat stable may be more than a coincidence, for the marsh
near it affords a good theoretical breeding ground for mosqui-
toes or Tabanus, and the dung thrown over the khud
from the bullock parao opposite the stable may be expected
to aid the breeding of Stomoxys, and the close proximity of
the bullocks when resting at the parao would give any insect,
capable of transmitting Surra, an opportunity to bite both
horses and bullocks within a short space of time. The appear-
ance given by the trypanosomes in the stomach of the
Stomoxys seemed to indicate that the organism was simply
undergoing disintegration.

                              SUMMARY.

There appears to be a connection between the old Bojia-
ghat stable and the cause of the outbreak, as on the three
different occasions the disease commenced here. The close
proximity to this stable of a cattle camping-ground on one side
and the presence of marshy land and jungle within a short
distance, are, in all probability, factors in the origin of