Page:Life Movements in Plants.djvu/269

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XXI.—A COMPARISON OF RESPONSES IN GROWING AND NON-GROWING ORGANS


By


Sir J. C. Bose,


Assisted by


Guruprasanna Das.


I have in the preceding series of Papers demonstrated the effects of various forms of stimuli on growth. I have also given accounts of numerous reactions which are extraordinarily similar, in growing and non-growing organs. In fact certain characteristic reactions observed in motile pulvinus of Mimosa and other 'sensitive' plants led to the discovery of the corresponding phenomena in growing organs. For fully realising the essential similarity of responses given by all plant-organs, growing and non-growing, I shall give here a short review of the striking character of the parallelism.

  1. The incipient contraction of a growing organ under stimulus culminates in a marked shortening of the organ.
  2. The similarity of contractile responses in growing and pulvinated organs.
  3. Similar modification of both under condition of sub-tonicity.
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