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it was stated to have trypanosomes. Fifteen days later it appeared 
in good health, and we were unable to verify the finding in the single 
observation made. Dr. Yale Massey showed us films of T. diinorphon 
made from the blood of a donkey which died of the disease at Ruwe 
in the Congo Free State. 
Goats are considered as immune by Europeans and natives alike. 
This view is held to such an extent that they will graze a herd of 
these animals over land intended for occupation in order to drive 
away the tsetse, which is said to be not only harmless to them, but 
also to be repelled by the odoriferous nature of the adult males. We 
were informed of many instances where goats had lived and bred 
within fly areas. From one such area a European purchased forty 
Iiead in February, 1907. They commenced to die immediately at 
the rate of one or tw'o a week, the symptoms being emaciation lasting 
for one or two months. In November three adults (all that remained), 
each of which had a kid, were examined with negative result. 
Native dogs are regarded as immune, and it is stated that natives 
will expose their dogs, a valuable asset to them, without fear. We 
have seen three cases of natural infection in ' essential kaffirs.’ 
English and Colonial dogs are considered susceptible; but if born or 
bred in the fly district their powers of resistance are said to be 
increased. 
No special symptoms are recognised. Gradual and progressive 
emaciation ; periods of manifest depression followed by others in 
which the animal appears brighter; lacrimation and nasal discharge ; 
these, taken with a history of passage through a fly district, are held 
to be sufficient for diagnosis. Oedema, enlargement of the 
superficial glands or paresis, are not mentioned. On autopsy an 
oedematous condition of the connective tissues and a paleness of the 
muscles are said to be constant; the presence of fluid in the body 
cavities has not always been noted by stock owners. 
Deaths are said to be more frequent just after the break of the 
rains, and it is considered that any undue exposure of an animal to 
water will ' bring out ’ the latent disease; so much is this held 
that we have been informed of cattle being purchased subject to a 
test of pouring a bucket of water over them. Should they not show 
evident signs of sickness within a few days, they are considered as 
free from ' fly.* Our observations at Broken Hill, and since, do not 
