It then became amoeboid, and in fifteen minutes had moved 
across two fields (Zeiss, 1-30 aperture, achromatic objective; No. 2 
eyepiece). The nucleus became distinctly visible (even before the 
flagellum was completely cast off), and its structure could easily be 
made out (fig. 11). 
The parasite now elongates (fig. 12), a constriction appears, and 
almost before division is complete a similar constriction takes place 
in each of the daughter cells to form four cells, all the cells being 
almost of the same size as the original mother cell. T he four cells 
divide into eight, the eight into sixteen, the sixteen into thirty-two, 
and the thirty-two probably into sixty-four* 
Preparatory changes were seen in the nucleus before the first 
division. These changes were difficult to follow owing to their 
rapidity. At one point a rapidly-moving little tongue process appears, 
surrounded by a very small differentiated area (fig. 12). In a second 
0r two a dull refractile area becomes visible a little distance from it; 
a second later another one appears, but it is somewhat smaller, and 
then still another (fig. 12); but almost before this latter has formed, 
! ‘ le four apparently merge into one large, highly-refractile, rounded 
area in which the little tongue is seen moving (fig. 13). This area is 
an obvious feature in many of the cells before division is complete, 
t first very bright in appearance, it gradually fades away , thus in 
0ne case it was formed at 3 21, it was much less visible at 3-24, it 
Cou ld not be distinguished at 3-25, and the cells had completely 
Danielewsky states that he has seen 120. 
