

198 



BOTANICAL GAZETTE 



[SEPTEMBER 



sq. cm., taken as the unit of area, 0! = 75.47 sq. cm. = 1.42, 

 £ = 3.546, c = i .076; ^ = 91 .43 liters per hour, here used as unity, 

 and zc'!= 165 .62 liters per hour= 1 .816. 



The calculated and experimental results again agree so closely 

 that the conclusion seems justified that they are within the limits 

 of experimental error. 



TABLE III 



Evaporation experiment with atmometer 



Temperature 

 outside 



Dewpoint 

 outside 



Dewpoint of 

 escaping air 



Evaporating 

 surface 



Wind 

 movement 



Found 



y 



Calculated 



y 



Difference 



25-2 



251 



25.0 



249 



2.2 

 2.2 

 2.2 

 2.2 



I30 

 12.7 



12.4 

 12.3 



I 

 I 

 I 

 I 



I. 816 

 I. 816 

 1. 816 

 1. 816 



10.8 



10. 2 

 10. 1 



IO-3 

 10.3 



IO. 2 

 IO. 2 







Averaj 



*e 







10.4 



IO-3 



— O.I 













25-3 



25-4 



25-4 



25-4 



25-4 



1.0 

 1.0 



0.9 



1. 1 

 1.0 



13.0 

 12.9 

 12.7 

 12.6 



1 12.4 



I 

 I 

 I 

 I 

 I 



I 

 I 



I 

 I 

 I 



12.0 

 11 .9 

 11. 8 



11. 4 



11. 7 



11. 8 



11. 8 



11. 7 

 11. 7 









A vera; 



?e 







11. 7 



11. 7 



O.O 













27.0 



26.8 

 26.6 



26. 2 



26. 1 



1.1 

 1.2 

 1.2 

 1.1 

 1.0 

 1.0 



152 

 152 

 14.8 

 16.0 

 152 



153 



I.42 

 I.42 

 I.42 

 1 .42 

 I.42 

 I.42 



I 

 I 

 I 

 I 

 I 

 I 



14. 1 

 14.0 

 13.6 

 14.9 



14. 2 



14-3 



14.7 

 14.6 



14-5 

 14.4 



14-3 

 143 







Avera 









— __— 



14.2 



14.4 



+0. 2 











t 



26.0 



25-8 



25-4 



25-3 



1.2 



i-3 

 1-4 

 14 



14. 2 

 14.4 

 13.6 



138 



I.42 

 I.42 

 I.42 

 I.42 



I. 816 

 I. 816 

 I. 816 

 I. 816 



13. 1 



131 

 12.2 



12.4 



131 

 12.9 



12.6 



12.6 







Avera 









12.7 



12.8 



+0.1 











1 



An examination in detail of the completed formula will show 

 whether it will continue to appear rational when the several 

 variables concerned are carried to their extreme limits. As / 

 increases, y will increase indefinitely. As / decreases, y will 



anish 



As 



t x increases, y decreases and vanishes when i L reaches /. As *, 

 decreases, y increases until / x reaches absolute zero, at which the 

 size of y will depend on /, a, and w only. As a increases, the value 





1 



