162 



Conical Rain and Evaporation Gauge, adjusted with 5| inches of Water for 

 Zero Point, and placed on Roof of Magnetical Ohservatory, March \, 

 1861. 



Observed. 



Inches. 



April 5, 1861, . . . . 





8-65 



May 4, 1861, .... 





3 '60 



June 8, 1861, .... 





3-00 



October 9, 1861, . . . 





8-40 



November 23, 1861, 





8-05 



January 18, 1862, 





8 04 



March 8, 1862, . . . . 





7-90 





7 



47-64 







6-806 



, This result gives for the fifty-three weeks an excess of rain-fall over 

 evaporation of 1-306 inches. Eut during the first week of exposure, 

 March 1 to March 8, 1861, and which is not included in the record of 

 the cylindrical gauge, 1-717 inches of rain fell ; showing that, probably, 

 an inch should be taken off the excess just given. 



If this reasoning be correct, it would serve to show that the evapo- 

 ration from the sloping side of the gauge compensated the diminished 

 area of the water suiface. 



Observatory Rain Gauge. 



Observed. 



Eain. 



March 1, 



1861, . 



0-086 



„ 2, 





0-214 





1-020 



„ 4, 





0-125 



)? 





0-002 



„ 6, 





0-040 



„ 7, 





0-230 







1-717 in. 



Appendix on the difeeeence between Evapoeation and Eain-Fall 



AT EnNISKILLEN. 



The following observations were made by the Rev. William Steele, 

 in the garden of the Eoyal School of Portora, near Enniskillen, by means 

 of a cylindrical tinned vessel, 10 in. diameter, placed 10 ft. above the 

 level of the ground, on the stump of a tree cut down for the purpose. 



