TRACTS ON VARIOUS SUBJECTS, &c. 93 



Upon an average, the number of days, throua^liout the year, on 

 vvhicli rain falls, is 135. The wettest months are usually January, 

 February, and March ; and July and August. 



As wet or dry seasons depend on heavy rains and fine showers, 

 the following is a comparison of the six years : 



1806, heavy rains and fine showers, - 92 days. 



ditto - - 79 days, 



ditto - - 58 days, 



ditto - - 71 days, 



ditto - - 78 days, 



ditto - - 60 days. 



Now, as my measurement of the fall of rain, from the 22d 

 February 1811, to the 21st of February 1812, inclusive, gave 

 22,4 inches, and this in one of the driest seasons in the above com- 

 parison, it may be presumed that in wetter years the fall of rain 

 at St. Helena exceeds that in London, and in several other places 

 in England. 



" Rain falls — At London, being the average of the following 

 years, 1774, 5, 6, 7, 8, 9, 80 ; 1789, 90, 91, 92 Inches 21.25 

 " Upminster _ _ _ _ 19.125 



" Lincolnshire, in medium season - - 18 



" Ditto, extreme wet - - - 24 



" Liverpool - _ _ _ 34.5 



" Townley, in Lancashire - - - 42.5 



" Kendal, in Westmoreland - - 61.25 



" Dumfries, in Scotland . _ _ 36.25 



" Glasgow, ditto - _ - _ 3i"» 



In India, there is a remarkably striking difference between the 

 seasons of rain, and at St. Helena, According to an exact mea- 

 surement, taken at Madras, by the late Benjamin Roebuck, Esq. 

 * Vide Philosophical Magazine, p. 79, Vol. XV. 



