As an example of this, I give a record (Fig. 27) obtained with a specimen in which nyctitropic movement was very pronounced.
The extent of the nyctitropic movement varies in individual cases; in some it is slight, in others very large.
One species of Phyllanthus takes up in sunshine the nyctitropic attitude of another species.
The description of this nyctitropic Recorder will be given in the next paper.
The obscurities in the nyctitropic movement of plants arises from the presence of numerous complicating factors.
The nyctitropic movement of plants affords another example of daily periodicity.