and it is considered that the bite of more than one fly is usnaDy 
necessary to give the disease. 
Cattle are held to be most siisrcptible, but cases are recorded ol 
animals which do well and breed in villages situated within fly areas. 
There is a fairly general impression that animals bom in the fly area 
possess a degree of immunity not enjoyed by others, and this isbeid 
to account for tlie herd.s which some native chiefs arc said to otm 
We have seen such a village near the River Kafuc, and have taken 
Glossina ifwrsitans within a mile and a half of it. The chief of this 
village regards the freedom of their cattle from tlie disease as being 
due to care in herding, and admits that if they were taken away from 
the old garden clearings except at night that sickness would be 
expected. Another village was frequently quoted as an instance of 
this inherited immunity, but on arrival there wc found that within the 
past two years most of the cattle had died of Hy disease, and the rest, 
which had been sold to a European, had also succumbed. We only 
met with one case which would lend to bear out this su^estion of 
local insusceptibility. 
1002, stock were purchased from a chief near the Kafue 
mile For fh been bred there and Gl. morsHam is found within hal 
hundrJ yaM^fSe^SP T"- P-chaser'a farm, within a t 
six were sold fat for 1 h*’ tluong which time one animal died suddenlr, a 
down the river ^ ^^^^bter. In 1905 the remainder were moved twenty mil 
these had g" en’blnh to'!-"! six deaths occurred. Fm 
excellent condition when exlmlntd^ ^P*^'**^ 
their lives within a mile November, 1907. The.se cattle had spe 
on them. Game is nlentif.n which had frequently been caught feedi 
have often been seen era,- l^ushbuck, puku, waterbuck, and harteb« 
Th^ =„ . r.f ® ^ yards from the homestead. 
of the formeT^ 'ri' donkey is disputed. A tea 
but we were nnt ■ f frequently been in contact with the tsets 
attributed to this ^ of any deaths which could be direct 
did not show ^>famination of eight of these mul« 
donkeys which are received the histories of thrf 
years without "ill effect^ ^reas for from one to thre 
susceptible to infectiorbv 
a badly infested district^ ' A second was taken mt 
immune. Its blood w August under the belief that it «'a 
however, had a good ^^''^luber by a layman, wIk 
o experience in blood examinations; am 
