276 



Sir F. Darwin. 



40 

 30 

 20 

 10 



Z^. . 



100 90 SO 70 60 50 



Fig. 4 (Experiment 4). 



Experiment 5. — January 3, 1910. P. lattrocerasus. Fig. 5. 



Time. 



Period. 



Rate. 



T. 



<!>■ 









° C. 



per cent. 



10.33 A.M. 



i 



39 4 



16 3 



61 



10.57 „ 



ii 



29 -6 



15-8 



72 



11.52 „ 



iii 



28-1 



16-0 



74 



12.19 p.m. 



iv 



22 -3 



16 4 



78 



12.37 ,. 



V 



21 -3 



16-4 



82 



12.46 „ 



vi 



17-2 



16-4 



87 



1.33 „ 



vii 



16 -5 



16 



85 



1.40 „ 



viii 



14 -3 



16 -1 



89 



1.54 „ 



ix 



10 -6 



16 -1 



94 



< 



100 90 80 70 60 



Fig. 5 (Experiment 5). 



During the above observations the bell-jar had been gradually lowered, i.e. 

 the supports replaced by smaller ones until only a crack, 1 or 2 mm. in height, 

 remained. The bell was now (1.57) raised to 7 mm. and a current of air 

 drawn through. The supports were gradually increased in height and finally 

 (3.20) the bell was removed altogether. 



