‘ Bandsaum derselben schr kurzer oder vollig fehicnder frcier Gcissel, 
‘rundem Blepliaroblast und niclit aufFallig zugespitzteni Hinterende.’ 
■ Uie Lange betriigt nach Zic’nanii 18-2O, biswcilcn bis zu 30^1, die 
‘ Breite 2 ~ 3 ^m ; der ruiide Blepliaroblast liegt nahe deiu meist etwas 
‘ zugespitzten Hinterende.’ To tliis we may add that Ziemann found 
difficult)' in differentiating ' sexual ‘ forms; an implication that 
this trypanosome is not subject to morphological variations of 
more than slight degree. Waiting on Trypanosoma casalboui, 
Laveran says ‘its length, including flagellum, is 21^, breadth c)/*. 
' Nucleus oval and situated towards the middle. The centrosome 
‘ round and distinct is placed near the posterior extremity, which is 
‘ rounded and not pointed. Undulating membrane is very slightly 
‘ developed, being little folded as in T. lewisi' 
A comparison of Liihe’s and Laveran ’s descriptions of T. vivas 
and T. cazalboui, respectively, shows liow little morphological 
difference there is between the organisms in stained film; and the 
similarity is accentuated when, referring to the movement in fresh 
preparation, Ziemann’s organism, named on account of its motility, is 
described as moving ' “ wie einen Hecht ” in mehr oder weniger 
gerader Linie quer durch das Gesichtsfeld schiessen lasst;' while 
T. cazalboiti is said to be ‘ very active, moving sometimes on itself, 
‘ at others soon leaving the field like an arrow.’ 
The animal reactions of T. vivax have been imperfectly studied. 
Comparing the natural disease induced in cattle, sheep and goats, we 
can note no great difference from La Soumaya. Experimentally, 
Ziemann is quoted by Sander and Hennigio as having had tlie 
following results: * Graue Ratten, Tod nach 8-11 Tagen; Deutscher 
Hund (?): emheimischer Schweine; nur leichte Erkrankung; 
‘Lsel: chronischer Verlauf . . . Qhne Krfolg: Katzen. Haus- 
geflugeln, erne weisse Ratte.’ Nabarro in his analysis of Ziemann’s 
p^er writes : Dogs, cats and pigs were found not to suffer from 
< ^ ^ infection. A dog and a native sucking-pig developed 
_ a slight temporary infection. White rats, geese, ducks, native hens, 
y ung tur eys, a native cat and an old pig were all refractory.’ 
^ t- ti Ziemann’s opportunities, it remains 
questionable that he was dealing with an organism showing marked 
not re experimental animals. Laveran has 
not recorded the results follow.ng .noculation ,n grey rats, but 
