147 



Table showing Evaporation for Periods of Four Weeks. 



Lunar 

 Month. 



Commencing 

 December 22, 

 1862. 



Commencing 

 December 21, 

 1883. 



Commencing 

 December 20, 

 1864. 



Mean. 



■ 



Inches. 



Inches. 



Inches. 



Inches. 



1 





6'47 



6-00 



6-23 



2 





7-02 



7-06 



7-04 



3 





8-51 



7'30 



7-90 



4 





6-79 



7-35 



7*07 



5 





7-12 



6*74 



6-93 



6 





6-38 



6*07 



6-22 



7 





5'67 



5-51 



5-59 



8 





5'74 



5 53 



5-G3 



9 





5'56 



5-60 



5-58 



10 



6-55 



5-07 



5-94 



5 85 



11 



6-86 



6-65 



614 



6-55 



12 



5-89 



6-68 



5 -46 



6-01 



13 



6-13 



6-82 



6-20 



6-38 



Total, . . 





84-48 



8090 



82-98 



The last column of this Table is shown graphically in Plate L, and 

 proves that the maximum and minimum of Evaporation follow the solstice 

 by intervals different in summer and winter ; the maximum occurring 

 three months after, or nearly at the time of the equinox, and the mini- 

 mum occurring one month and a half after its own solstice. This result 

 differs from that formerly found for Dublin, where the maximum and 

 minimum of Evaporation coincide very nearly with the times of the sol- 

 stices themselves. 



This difference is produced by causes not difficult of detection. 



