226 LORANDE LOSS WOODRUFF 
A ITI group. Monads were practically absent from the two 
cultures of this group, and this is the only instance in which they 
did not appear in numbers sufficient to be considered. There 
were, perhaps, 100 per cc. at several counts. This dearth is 
accounted for, I think, by an exceptionally heavy growth of Col- 
poda, which occurred in this group very early (cf. table 2 and fig. 3). 
A IV group. The monads appeared on the 2nd day, attained 
their maximum of 1000 per ce. on the 4th day and reached their 
minimum on the 6th day. 
BI group. These forms appeared on the 2nd day, attained a 
maximum of 4200 per ce. on the 8th day, declined to 500 per ec. on 
the following day and then gradually became less and less until 
by the 23rd day their number was negligible. On the 36th day, 
however, they reappeared, attained the number of about 2000 
per cc. on the 40th day, and reached extinction on the 60th day. 
B II group. On the 4th day there were 1200 monads per ce., 
and on the 8th day they had entirely disappeared. 
BIITI group. In this group the monads attained a maximum 
of 5000 per ee. by the 9th day, and by the 12thday there were none 
remaining. 
BIV group. A maximum of 1400 per ee. was reached on the 
3rd day of the life of the cultures, and then a rapid decline resulted 
in extinction by the end of the first week. 
C I group. In these three cultures the average maximum 
number of monads, nearly 8000 per ce., occurred on the 15th day, 
and was followed by an abrupt decline ending with their disap- 
pearance on the 20th day. The maximum of Colpoda occurred on 
the same day as that of the Monads. 
C III group. In this group, represented by a single infusion 
(C-31), the monads attained a maximum of over 8000 per cc. on 
the 8th day, declined rapidly to 2500 per ee. on the 13th day, and 
reached a minimum of practically zero on the 24th day. 
CIV group. Here the monads rose to the number of 5000 per 
ec. on the 17th day, declined to about 2500 per cc. on the 21st 
day, then rose to their maximum of 7600 on the 27th day, and by 
the 32nd day had reached a minimum. 
