150 
E. A. MINCHIN AND H. M. WOODCOCK. 
direction, apparently unable to free themselves, and were 
dragging the cell here and there. (2) Large, stout, sluggish 
forms, with a very long, tapering atlagellar end, and a much 
pleated undulating membrane ; the free flagellum was short. 
These individuals travelled very slowly, scarcely moving from 
one place ; they often seemed to get wedged in among clumps 
of cells. The membrane, however, was in a continual state 
of rippling, and an interesting point was noticed in connec- 
tion with this, namely the reversal of the movement. The 
Avaves ran usually from the region of the kinetonucleus 
toAvards the flagellum, and the movement in this sense Avas 
continued for the longer period ; but it was frequently seen 
to change, Avlien the Avaves ran from the flagellar end toAvards 
the kinetonucleus, for a short time. All of a sudden, and at 
irregular intervals, the movement would change again and be 
once more in the original direction. (3) The third type of 
parasite seen Avas quite a small form, not much longer than 
a blood-corpuscle ; these individuals were somewhat stumpy 
in appearance, Avitli the aflagellar end abruptly pointed. 
These forms Avere not noticed at first; they were probably over- 
looked through being hidden by or among clumps of cells, out 
of which they managed later to worm their Avay. They had 
a Avriggling movement, but did not seem to travel much. These 
small trypanosomes appeared to have a predilection for 
attaching themselves by the tip of the flagellum to the 
surface of the glass, either to the slide or the cover-slip. 
On exaininiug a preparation the following morning (some 
ten hours later), one of the small forms Avas observed slowly 
Avrithing about, quite free from any corpuscles, but with the 
tip of its flagellum firmly attached to the slide by a distinct 
dot or granule. The trypanosome, by its movements, pushed 
and pulled its body from a,nd to the spot where it was attached, 
without, however, becoming free. The membrane undulated 
slowly ; its flagellar border appeared distinctly to be Avound 
spirally round the body of the parasite. The body itself 
seemed somewhat stiff, and only changed its curves slightly 
and slowly. Another trypanosome, probably belonging 
