4l6 PLANT RESPONSE 



stamens of flowers. There are also other organs, which are 

 more or less strictly radial, such as the peduncle and the 

 hypocotyl. But in these latter cases care should be taken 

 that the specimen have been so grown, that its different sides 

 have been subjected to uniform conditions of light or dark- 

 ness ; for one-sided illumination tends to produce anisotropy, 



Fig. 1 68. Complete Apparatus for Crescographic Record under Ordinary 

 and Balanced Conditions 



With specimens of all the types mentioned, I have obtained 

 multiple growth-responses when the constituent pulsations 

 were not too rapid. In some cases, indeed, the effects 

 were so marked that they did not even require a balancing 

 arrangement to render them conspicuous. xA.s an instance 

 of this, I shall give a record of the growth-response of a 



