Elementary botany . Fig. ii8. Dark chamber with opening at one side to show heliotropism,(After Schleichert.) IRRITABILIT Y. I29 were grown in a box, when they were about $$cm mgh for nearly two days, so that the light was midday on the second day the box was removed, and theleaves on the covered plants are well represented by fig. ng, whichwas made from one of them. The leaves of the other plantsin the box which were not covered were horizontal, as shownbv fig. 120. Now on leaving these plants, which had exhibited

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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany