9S 



Tab. XV. 



Total Growth. 



Leaf-stalk II. 



VII. 



Flower-stalk II. 



28.5 (in 7 days) 

 68.2 ( „ ) 

 81.0 ( „ ) 



Day 



Growth. 



Night 

 Growth. 



20.5 (72^) 8.0 (28^) 



44.0 (65^) 

 51.3 (63%) 



24.0 (35^) 

 29.7 (37^) 



Mean 1 ) 

 .Day 

 Temp. 



29.2 



29.0 



Mean 



Night 

 Temp. 



25.2 

 24.6 



Under 'day' and ' night growth/ are given, besides the absolute numbers, 

 their ratios to the total growth in percentages, put in parentheses. The day 

 growth amounts to about 65 — 70% of the total growth, while the night 

 growth is only 30—35%. We can roughly say, therefore, that the ratio 

 of the former to the latter is § : i. 



The curves of growth during day and night are also given in PL IV. 

 It will be noticed that the curves of growth oscillate nearly uniformly with 

 the temperature curve, and that the grand curve (grosse Curve) showing the 

 grand period (grosse Periode) is almost indifferent to the small undulating 

 curve of the day and night growths. 



The next thing to be noticed in the tables XII — XIV is the different 

 rate of growth in the forenoon and afternoon. The growth is greater in 

 forenoon than in the afternoon. The data of seven days observations are 

 summarized as follows: — 



Tab. XVI. 





Day 

 Growth. 



Fore- 

 noon. 



After- 

 noon. 



Half 

 Night 



Mean 



Temp. 



a.m. 



Mean 



Temp. 



p.m. 



Mean 

 Temp. 



Night. 



Leaf-stalk VI. 



20.5 



13.4 



7.1 



4.0 



28.0 



30.4 



25.3 



VII. 



44.0 



24.5 



10.5 



12.0 



?> 



>> 



» 



Flower-stalk II. 



51.3 



28.4 



22.9 



14.6 



27.9 



30.2 



24.9 



The less growth in the afternoon, when the temperature is highest, is 

 probably due to the retarding action of the light, co-operating with that of 

 the low humidity. I have also recorded in the above table the half night 

 growths, in order to compare them with those of the fore-noon and after-noon 

 in the same intervals of time 

 of the three. 



The night growth is seen to be the least 



1 ) The mean temperatures noted here are the average numbers of 7 days. 



