Figure 8.

Effect of increased P_g on E. ●, Increasing pressure; ○, decreasing pressure. Each point is the mean of three 3-min readings and pressure was changed every 10 min. The light intensity for these experiments were less than for Figure 5 because, to get accurate weights, the plant had to be moved so that it did not touch nearby objects; the lights were not moved with the plant. Consequently the initial E values were lower than for most other experiments.