W. L. Yakimoff and others 37 
middle parts of European Russia, where camels are imported from Astrakhan 
and the Urals. 
III. MORPHOLOGY OF THE TRYPANOSOME 1 . 
In fresh preparations the living parasite exhibits fairly active movements, 
slower than those of T. brucei but more active than T. equiperdum (Russian 
strain). 
In stained preparations the aspect of the parasites varies somewhat in 
different experimental animals. 
(а) Camels. Protoplasm slightly spongy; posterior end somewhat rounded. Nucleus 
oval, well-defined and granular; blepharoplast lightly stained, with a light zone in proximity 
to it; undulating membrane feebly developed. 
(б) White mouse. Protoplasm spongy; posterior end more rounded. Nucleus granular 
and containing 2-4 more densely staining particles. Blepharoplast above the light zone. 
The flagellum of undulating membrane directly enters the blepharoplast. 
(c) Rat. Protoplasm more or less homogeneous; posterior end more pointed. No 
light zone near blepharoplast; undulating membrane well developed. 
( d ) Guinea-pig. Protoplasm more or less uniform; posterior end rather pointed. 
Undulating membrane well developed; flagellum starting from the blepharoplast. 
(e) Rabbit. Protoplasm not homogeneous. Posterior end rounded. 
(/) Dog. Protoplasm granular; blepharoplast often stains feebly. Involution forms 
frequently encountered. 
(g) Horse. Protoplasm homogeneous. First day of infection parasites attenuated and 
slender; later they have the more common shape. 
( h) Cattle. Protoplasm areolar; posterior end rounded. Undulating membrane well 
developed; flagellum starting directly from blepharoplast. 
(i) Sheep. Protoplasm areolar; posterior end rounded. A light zone near blepharoplast. 
(j) Swine. Protoplasm homogeneous, but granular; posterior end blunter. Chromo¬ 
somes visible in nucleus; flagellum rather short. 
This parasite approximates to the general type of the Nagana and Surra 
trypanosomes. Multiplication is by longitudinal fission. 
IV. THE DIMENSIONS OF THE TRYPANOSOME OF 
TURKESTAN CAMELS 2 . 
Since the measurements of trypanosomes are in some cases characteristic 
of the species of parasite, we have paid considerable attention to this detail, 
and have measured trypanosomes from camels and also from other experi¬ 
mentally infected animals. Also through the kindness of Messrs Feinschmidt 
and Shukewitsch we have measured specimens obtained from camels from 
the Astrakhan and Ural districts. 
In all cases the following measurements were taken: total length including 
flagellum; the length without the flagellum; total width; length of nucleus; 
1 By W. L. Yakimoff. 
2 By W L. Yakimoff and S. K. Popoff. 
