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It would, therefore, have been a much
better plan to have used hemispherical glasses, if we had possessed them of
all sizes, and if the bending part of the shoot had been distinctly hinged
and could have been placed so as to have formed one of the radii of the
sphere. But even in this case it would have been necessary afterwards to
have projected the figures on paper; so that complete accuracy could not
have been attained. From the distortion of our figures, owing to the above
causes, they are of no use to any one who wishes to know the exact amount
of movement, or the exact course pursued; but they serve excellently for
ascertaining whether or not the part moved at all, as well as the general
character of the movement.]
In the following chapters, the movements of a considerable number of plants
are described; and the species have been arranged according to the system
adopted by Hooker in Le Maout and Decaisne's 'Descriptive Botany.' No one
who is not investigating the present subject need read all the details,
which, however, we have thought it advisable to give.


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