MR. A. J. EWART ON ASSIMILATORY INHIBITION. 
387 
TABLE G. 
Selaginella helvetica, 
Oxalis Acetosella. 
Chara fragilis. 
Elodea canadensis, 
No evolution of O at 38° C., weak in 1 h. at 20° C., 
fairly active in 4 h., quite in 1 h. 
No evolution of O at 38° C., weak in 4h. at 20° O., 
moderately active in 1 h., quite active in 2 hrs. 
Slow creeping rotation, which in 5 minutes is fairly 
active. No evolution of O at 38° C., weak in 4 h. 
at 202 C., active in 1 h. 
No rotation, slow in 5 minutes and in 15 minutes 
fairly active. No evolution of O at 38° C., weak in 
1 h., quite active in I h. 
If, however, plants are kept at a raised temperature in a limited 
supply of air for some time, a stoppage of assimilation, persisting 
for some time after the plant has been brought under normal 
conditions, may be fairly readily induced. The effect is really due 
to the plants being subjected to partial asphyxiation, and is more 
readily produced in Phanerogams than in Mosses, owing to the 
former plants being more sensitive to asphyxiation than the 
latter are. The results of heating under such conditions are 
shown in Table H, the young plants being kept in pots under 
closed bell-jars for a day at 37? C. to 38? C., examined at the 
TABLE H. 
Helianthus annuus. 
Cucurbita Pepo. 
Vicia Faba. 
Ricinus communis. 
Zea Mays. 
Aspidium violascens. 
Phaseolus vulgaris 
| 
No evolution of O. After 1 h. at 20? C. still none. | 
After 3 hrs. weak, in 6 hrs. fairly active, and in 
1 day quite active. 
No evolution of O, weak in 2 hrs., fairly active in 4, | 
quite active in 1 day. 
. No evolution of O. Stems and undeveloped leaves | 
only remain living. The former show after 1 day | 
a distinct evolution of O. 
Cotyledonary and young undeveloped foliage leaves 
living. Protoplasm in many of cotyledonary cells 
aggregated in 3 to 6 spherical masses ; when these 
fuse together, the cell is again plasmolysable. 
Chlorophyll grains normal, but frequently massed 
together. No evolution of O, none after 5 hrs., 
| weak in 10 hrs., and in 1 day fairly active. 
