158 



JAS. J. SIMPSON — ENTOMOLOGICAL 



and the intensity of the rainfall in each month. The first obvious deduction to 

 be made from it is the enormous rainfall in the coast towns, i.e., 149*63 inches 

 at Bouthe and 136*59 inches at Freetown, with a progressive diminution in the 

 places more remote from the coast ; e.g., Bo and Batkanu (60 miles), 119*16 and 

 107*73 respectively ; Darn (100 miles), 87*20 inches, and Kaballa (about 150 

 miles), 80*13 inches. 



On one year's data it is hardly permissible to compare the monthly distribution 

 of the rainfall, but the contrast between Bonthe and Kaballa can hardly be 

 overlooked. 



Table C. 







Nut 



nber of day 



s on 



which 



Rain fell 



in 1911. 











Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Total. 



Freetown ... 



2 



1 



1 



6 



18 



29 



30 



30 



26 



27 



11 



3 



184 



Bonthe 



1 



1 



2 



9 



19 



23 



29 



30 



26 



24 



15 



2 



181 



Bo 



2 



1 



7 



11 



19 



25 



30 



28 



29 



25 



15 



1 



193 



Batkanu ... 



— 



— 



2 



6 



9 



26 



31 



31 



27 



30 



14 



1 



177 



Daru 



— 



5 



10 



12 



18 



21 



21 



19 



22 



20 



15 



— 



163 



Kaballa ... 



— 



— 



1 



8 



13 



22 



25 



23 



23 



26 



5 



— 



146 



Table C shows the number of days on which rain fell in each month in 1911 at 

 the same six stations. In each case Bo is rather anomalous, but no deduction is 

 advisable from only one year's records. On the other hand, this table bears out 

 the last in such a way as to show 7 that not only does the rainfall diminish in 

 amount from the coast northwards, but the number of wet days also diminishes 

 in a like manner ; in other words, the total amount of rainfall is not due to 

 greater concentration on a few days but is spread more uniformly over the rainy 

 period. 



Table D. 









Percentage Humidity it 



, 1911. 













Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Mean. 



Bonthe 



83 



84 



75 



84 



84 



84 



84 



88 



74 



89 



82 



89 



83 



Freetown ... 



79 



76 



76 



75 



82 



84 



88 



90 



87 



82 



80 



79 



82 



Daru 



78 



62 



70 



74 



90 



85 



88 



88 



90 



87 



79 



83 



80 



Bo 



63 



64 



92 



71 



80 



84 



84 



83 



83 



79 



83 



75 



78 



Batkanu ... 



66 



60 



75 



67 



80 



80 



83 



89 



79 



83 



84 



83 



77 



Kaballa 



48 



58 



56 



Q6 



78 



78 



88 



88 



83 



82 



83 



54 



71 



In the above table is given the percentage humidity for each month in 1911 at 

 the same six stations, and here again we find that the mean annual humidity is 

 much less in the hinterland than on the coast. But it must be noted that the 

 annual mean is not proportionately decreased by every monthly mean. During 

 the rainy season — July, August, September, October and November — the 

 humidity of Kaballa varies but little from that at Freetown (in one month, 



