

APPENDICES. 



Experiment III. 



145 



one. 



iferior leaf 



Experiment IV.— Flame applied immediately above 



beyond the point of application; no action in any beneath 



from the superior 



beyond 



t/erior leaf and far ft 



the superior one. 



b 



Efects following the searing of a point in the course of an axis with strongly heated forceps, 



Experiment V 



Forceps applied to the axis close beyond 



superior one 



a n inft 



Progressive centrifugal action of all the leaves along the 



haf 



f> 



the ntj • 



point of application; no action beneath the point of application. 



course of the axis beyond the 



VII. VIII. IX. X 



Experiment XI 



ith 



Forceps applied immediately above the inferior leaf.— Action 



beneath the point of application and in all those above it. 



of experiment V. 

 in the first leaf 



In a series of thirty similar experiments in which oomplete movements occurred in all the hi vet 



on the axis beyond the point of application, movements occurred in the first leaf beneath it 

 five instances, and in all of these the point of application was very close to the origin vi the 

 petiole from the axis. 



in only 



primary 



c. — Efects following focussing the rays of the sun on a given point in the course of 



a j is. 



XII. — Focal point close to the origin of the leaf 



and about two 



* 



one next above #.— Complete, spreading, centrifugal action in all the leaves above the point of applica- 



tion; no action whatever in any leaf beneath it. 



XIII. — Focal point close to the origin of the leaf 



about three 



the one next above it. — Complete 



." 



beneath 



XIV 



no action what- 



)f the leaf 



Complete action in all the distally situated leaves; action in the leaf imme- 



from the one next above it 

 diately beneath the site of application. 



Experiment XV. — Focal point about midway between the leaves beneath and above it. Action 



the nine leaves situated distally; no action whatever in any leaf beneath the point of application. 



and o half 



in all 



XVI 



fi 



Action 



)/ the leaf beneath it and about thirteen inches ft 



in 



beneath 



the point of application. 



In a series of nineteen experiments of this nature, in which movements occurred either in all the 

 distally situated leaves or in a considerable number of them, action only occurred beneath the point of 

 application in five instances, and in all of these the point of application was very close to the origin of 

 the petiole of the leaf next beneath it and movements were confined to the latter only. 



As has already been pointed out in Appendix E, the results following the local application of heat 



course 



vary 



of atmospheric and telluric humidity 

 prevailing at the time of experiment. When, as in the case of the experiments detailed above, humidity 

 is moderate or low, the application is followed by very extensive centrifugal propagation of movements, 

 extending frequently along the whole of the distal portion of the axis ; but where this is no longer the 

 case, propagation diminishes in extent and completeness; and where humidity attains maximal propor- 



be attended bv an entire absence of any appreciabl 



XVII.— The points of a pair of 



after a heavy fall of 



ain 



Spreading 



;ly-heated 

 occurred 



were applied to an axis just 



the action was incomplete; for, whilst the primary petioles 

 pinnules showed only very slight displacements 



b 



deeply depressed, the pinnae and 



XVIII.— July 20th, 8 a.m. Atmospheric temperature 



Heavy rain had fallen during the course of the previo 

 experiment^ and everything was drenched with moisture. 



rain was 



80-5°F. En 



ill filling gen 



at the time, of 



heated pair of 



