22 



TOPOGRAPHY 



visited by such heavy falls of rain as in 1838 and 

 1845, only once in seven or eight years. The average 

 fall of rain each rainy season, commencing from 

 the September of one year, and terminating in the 

 May of the following year, may be estimated at 

 twenty-eight inches. The following table exhibits 

 the average fall of rain in each month for a period 

 of twenty-five years. 



Table showing the average quantity of rain in each 

 month, and the average number of days in which rain 

 fell in twenty-five years, from 1812 to 1836. 



From the foregoing Table it appears, that the 

 average quantity of rain which falls in Gibraltar during 

 one year is twenty-eight inches and five-tenths, and the 

 average number of days in which rain falls during 

 the same period is sixty-nine and a half, and that 



