ME. A. J. EWART ON ASSIMILATORY INHIBITION. 
417 
TABLE Y. 
Chara fragilis. Elodea canadensis, 
After 4 hours| Rotation present, but slower | No rotation. Very weak evol? 
in 1 p.c. than normal. Mod. active! of O,none in parts. In lh. 
evol® of O. In water in| in water slow rotation, and 
i to i h. rotation and evol” | in} fairlyactive. Assim. still 
of O are active. weak, but in 1 h. both are 
active. 
4hoursin | Slow creeping rotation. Evol" | No assim. or rotation. In }h. 
2 p.c. of O extremely weak, ornone.| slow rotation, but no evol? 
In jh. evol” of O mod. ac- | of O. In 1 h. rotation ac- 
tive, rotation quite active. | tive, and evol" of O. mod. 
In 1 h. active assim. active, and in 2 b. quite 
active. 
8hours in | No evol? of O, slow creeping | No rotation or evol” of O. 
lp.c. rotation. In water in } h.| Rotation active in many cells 
weak evol” of O and mod.| in  h., and faint evol" of O, 
active rotation. Bothactive| which in 1 h. is weak and in 
in 1 to 2 h. ] h. active. 
8 hoursin | No rotation or assim. In!h.| No rotation or evol” of O. 
2 p.c. in water very weak or no| Rotation active in many cells 
evol? of O and slow rotation. | in 1 h., but still no evol” of 
In lh. weak evol» of O in| O. In i h. faint evol? of O, 
all cases, and mod. active| which in 1 h. is moderately, 
rotation. In2-3 both active | and in 2 h. quite active. 
in all living cells. 
24 hours in | End and cortical cells dead, | Almost allleaf-cells living. In 
1 p.c. but over greater part of fila- | 1 h., active rotation in many 
ments medullary cells remain | cells but no evol" of O. In 
living and show in 1 h. weak | 1 h. very weak evol” of O in 
and in 2h. fairly active evol” | many cases, aud in 1 h. weak 
of O. in all cases, in 2-3 h. active. 
24 hours in | Plenty of medullary cells liv- | Few leaf-cells at baseand mid- 
2 p. c. ing and showing in 1 h. faint, | rib living and showing in 1 h. 
in 2 h. weak, and in 3-4 h. active rotation. After 1 h. 
active evol® of O. no evoln of O, weak in 2 h., 
and in 4 h. mod. active in 
parts. In 1 day all living 
cells show distinct assim. 
few cells remain living, and in Chara only the medullary cells. 
After the latter have been kept for 2 or 3 days in water exposed 
to light the cortical cells bleach and become transparent, when 
the green rotating and assimilating medullary cells come dis- 
tinctly into view and may remain living and assimilating for more 
than a week after the rest of the plant has been killed. 
