336 
functions of a museum wherein all t\'pe species are maintained and 
strictly guarded. 
If we eliminate T. letoisi and allied species as not occurring in the 
blood of the higher mammals, there remain thirteen named species 
all more or less accepted and distinctive, which an observer may meet 
in man or the domestic animals. These are 7 *. gambiense, T. evansi, 
T. brucei, T. equiperdmn, T. equinutn, T. dimorphon, T. theiUri 
(including some of Lingard’s forms met in India), T. vivax^ T. nanum, 
T. congolense, T. cazalboui, T. pecaudi, and T. sudanense. On 
morphological grounds it is possible to distinguish: — 
T. l/teileri, on account of its relatively immense size, and further 
from its animal reactions, being parasitic only in the blood of 
bovines. Dutton and Todd, however, describe a trypano¬ 
some morphologically recalling this organism as occurring in 
the blood of a Tragclaphus scriptus in the Congo Free 
State .2 
T. cquinum, which in stained preparation (dry method) shows a 
uniquely small Ijiepharojilasl. On epidemiological grounds 
in addition, by ijcing limited to South America. 
By adopting certain standards of animal reaction, wc can regard as 
distinctive: — 
T. gavibiense, as being the only one, so far as known, pathogenic 
to man. The human subject not being available for inocu¬ 
lation, the diagnosis of forms recalling this species morpho¬ 
logically would remain work for comparison with types. 
T. cqmperdimi, on the grounds of production in equines of quite 
c laracteristic clinical symptoms; and being unique among 
trypanosomiases of the lower animals in transference 
naturally by coitus. 
me named species remain to be dealt with. By the adoption of 
divided standards these can be sub- 
Rriort! 'T i” P“"‘ of '*«■ of 
pnonty, T y, 
as ant ni Tt "’’'"■ory, and are open to criticism, 
