the last few days of life in a few cases, when the stumpy type was 
more frequently seen. 
If the distinction between ‘ stumpy ’ and ‘ long ’ is based upon the 
possession, by the latter, of a definite flagellum, this was not 
encountered in cattle. Its appearance, however, in sub-inoculations 
indicates that the parasite in question belongs to the dimorphon 
group. ‘Tadpole’ forms were found in every animal, with the 
exception of one moribund case mentioned later. They measured 
from 975 to 15-3 (i in length, and up to 1-5 n in width. The body 
protoplasm stains a rather deep blue with the Giemsa stain, granules 
rarely being present; blepharopJast terminal or sub-terminal, small 
and rounded: nucleus a short oval, 17 to 2'5 in length, staining 
homogeneously a rather dark purple. Undulating membrane very 
rudimentary; in some, a small, fin-like, single fold could be seen. 
Flagellum absent, but an anterior prolongation of the protoplasm 
occasionally supported a minute extension of the rim of the 
undulating membrane. The posterior extremity is usually bluntly 
angular, but every gradation was met with. The greatest width lies 
posterior to the nucleus. Forms slightly larger than the above, which 
may be classed as ‘ stumpy,’ were occasionally seen in some animals, 
particularly in those in which the disease was running a more acute 
course, and have been constantly observed, but they become 
relatively more numerous towards death. In one animal, which had 
not shown organisms on two examinations previously, only this form 
was found at a third examination when the beast was moribund. It 
was not constantly to be observed at death ; in five animals none but 
what are termed ‘tadpole’ forms were seen. This form measured 
from 1775 to 2V2$n, and is of a stouter build than the 'tadpole.' 
The protoplasm assumes a pinker tint, the blepharoplast is better 
defined the nucleus almost invariably distinctly rounded and staining 
ess deeply, and the widest part of the body is more usually on this 
level. An undulating membrane could be more easily distinguished, 
m some rare cases two or three folds being visible, and the bordering 
nm IS commonly produced with the anterior extremity of the body to 
form an abruptly square-cut bristle-like beak, not exceeding 2n in 
length, but prominent in a well-stamed preparation. Granules were 
seen in some, and divisional forms of this type were encountered. The 
distinction between this form and what is described as ‘tadpole’ is 
