APPENDICES. 



131 



the tips of axes was followed 



no conspicuous exudation, but 

 inv leaves alone the course of tl 



Iripefal propagation of 



Experiment 1IL— August 20th. There had been heavy shoiars in the morning, so thai the soil 



IMS 



saturated, but subsequently continuous radiant sunshine had prevailed. I p.m. 



to direct sunshine and the leaves were in maximal 



urnal position. 



posed 

 f the tips of axes 



led to local exudation of liquid, but was unattended by the occurrence of any petiolar movements. 



fJ-30 p.m. — The leaves were in full nocturnal position. Amputation of the 

 extensively propagated movements of deepest petiolar depression along 



of axes wu follow 1 by 

 > of the in iured nhoot. 



In comparing the results of experiments carried out respectively in the morning and evening it 



cannot, of course, be maintained that all the differences which are present— that aU 



of 



increased "irritability " in the evening 

 alone; for, as a rule, the conditions 



be credited to the coincident depression in a»imilutory activity 



much 



than they are in the morning. During periods of continuous settled weather diurnal 



tmosph 



high. This is shown by 



um in the afternoon and evening, whilst in the morning it is still relatively 

 he figures in the following table of averages, derived from a series of weekly 

 1892-93 with which mv friend Mr. C. Little has kindlv furnished 



Average atmospheric himidity at varitua iiims of day. 100= saturation. 



1892. 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



• • • 



t • • 



• • • 



• • • 



♦ • • 



« • • 



• # • 



• • • 



• • • 



• • • 



• • 



• • • 



• ■ ■ 



• • • 



• • • 



• • • 



» ♦ * 



• » • 



• • t 



• » • 



6 A.M. 



902 

 84-5 



880 



87-8 

 89-0 



920 



96-0 

 94-8 

 9575 

 95-2 



87-7 

 80-25 



8 A.M. 



867 



714 



5-6 



i 



77-75 



792 



82-25 



90-25 

 89-0 



855 

 82-6 



7775 



79-5 



10 A.M. 



02-5 



48-G 



48-75 



630 



70-C 

 73-25 



86-75 



80-4 



77-25 



72-6 



595 



53 25 



4 P.M. 



40-5 

 350 

 310 

 640 



59-2 

 73-70 

 83-0 

 78-4 



7773 



G5-6 



470 

 35-75 



10 P.M 



748 

 71-75 



810 



85-2 



90-0 



925 



91-4 



B2-5 



91-4 

 920 



88-25 



Annual averages 



• •• 



90-6 



813 



66-3 



509 



8575 



1893. 



January 

 February 

 March | 

 April 



May 



June 



July 



August 



September 



October 



November 



December 



•a • 



• • ♦ 



• • » 



• • • 



• • • 



• • • 



•• • 



• • • 



• * • 



• • • 



• » • 



• • • 



• 9 • 



• •• 



• • • 



• • • 



• • • 



• • • 



• • • 



• • • 



• • • 



• « • 



• • • 



• • • 



» • * 



• • ■ 



G A.M. 



93-0 

 94-75 



94 25 

 91-25 



89-2 



92-75 



92-8 



940 



95-25 



92-8 

 85-5 

 94-25 



8 A M 



90 



87-5 



b8*5 



80-75 



81-0 



86-25 

 88-0 



87-5 

 90-25 



84-0 



6-75 



( 



8225 



10 A.M. 



630 



71-75 



60-0 



6475 



' 69-20 

 84 50 

 8440 



810 

 8525 



7825 



620 



04-25 



4 P.M. 



40-6 



63-0 



54-5 



540 



59-8 



82-75 



82-40 



770 



82-75 



73-25 



57-5 



50-25 



10 P.M. 



83-4 

 910 



83-25 

 85-25 

 81-40 

 89 25 

 89 



90-5 

 2-75 



940 



920 



91-25 



Annual averages 



« • • 



92-4 



85-2 



728 



64-7 



88-2 



