supposed acceleration of the revolving movement towards the light.
It appears from the observations given in 'The Power of Movement in
Plants,' p. 451, that these conclusions were drawn from insufficient
observations, and are erroneous.




THE MOVEMENTS AND HABITS OF CLIMBING PLANTS.




CHAPTER I.--TWINING PLANTS.



Introductory remarks--Description of the twining of the Hop--Torsion
of the stems--Nature of the revolving movement, and manner of ascent-
-Stems not irritable--Rate of revolution in various plants--Thickness
of the support round which plants can twine--Species which revolve in
an anomalous manner.

I was led to this subject by an interesting, but short paper by
Professor Asa Gray on the movements of the tendrils of some
Cucurbitaceous plants. {2} My observations were more than half
completed before I learnt that the surprising phenomenon of the
spontaneous revolutions of the stems and tendrils of climbing plants
had been long ago observed by Palm and by Hugo von Mohl, {3} and had
subsequently been the subject of two memoirs by Dutrochet. {4}