MR. A.J. EWART ON ASSIMILATORY INHIBITION. 
TABLE X. 
415 
Utricularia vulgaris. 
Elodea canadensis. 
evoln of O, but rest show 
none. After 5 h. all living 
branches show weak evol” of 
O, which in some younger 
branches is active. After 
1 day fairly active assim. in 
In O'l p.c. | Almost all branches living. | Most leaves living but no evoln 
solution No evol” of O. In 1 h. mod. | of O or rotation. In most 
for 16 hours.| active in parts, weak or ab- | leaves apical 1, though at 
sent in rest. In 4-6 h. all| first living and  plasmo- 
living branches show dis- | lysable, dies without re- 
tinct evoln of O. covering. In 1 h. mod. ac- 
tive evoln of O at bases of 
leaves, weak or none in 
middle portion. In 4 h. 
distinct assim. is shown by 
all living cells. 
In 0:1 p. c. | Plenty of branches entirely or | In centre of apical tufts leaves 
solution partly living. Most living | with allcells living, and show 
for 2 days. | young branches show weak |` weak evol» of O, which in 
2-3 h. is active. Rest of 
leaves only basal portions 
living, no evol^ of O, none 
after 2 h., weak in 5 h., and 
in 1 day all living cells show 
fairly active assim. 
all living branches. 
Living plants immersed in dilute acid or alkaline solutions 
tend in both cases to neutralize them, jn the one case removing 
-acid and in the other alkali. When a cell is killed by immersion 
in a solution of ammonia or ammonium carbonate, it does 
not contract but is fixed in a condition of rigor, whilst the 
chlorophyll grains, beyond becoming a somewhat darker green, 
.do not alter, and retain their green colour, provided the solution 
remains alkaline, for several days without fading. Hence the 
appearance of the dead cells differs but little from that of a 
Wiving one, and the loss of plasmolysability is the only reliable 
indication of death. As we have seen, a cell may remain plas- 
molysable for a short time after it has totally lost all power of 
recovery, z. e., a dying cell does not immediately lose its plasmo- 
lysability ; the complete change from lifeto death is by no means 
instantaneous, but involves a series of changes following one 
another in a certain sequence. 
