1919.] 



RAINFALL AND FROGHOPPER BLIGHT. 



155 



to 1902. Every change of rainfall is sseii to be reflected by a change 

 in the crop. 



In Barbados whsre the rainfall is higher (40 to 80 inches) the 

 correlation is less exact. Fig. 2 shows the rainfall and total sugar crop 

 of the island from 1870 to 1894. It will Ije seen, however, that even 



(0 



5b 



r 



1 



10 





I 



ri <"• > . • • • • « ..Crtj) • 



T^m^all a«3 Sugar Crojj 



'b?8"'k'2-^ 3^ irs ^ It-} -i -fj <iie -i -z -i -I, s -b -7 -3 -<? -v*!! -i -i -^ 



to 



7o "3 

 <» 



to' 



?1> 



o 



•I 



k° 



30 I 



20 



10 J2. 



S 

 o 



o 



Fig. 2. 



Fig. 2. —Annual rainfall and sugar crop of Barbados 1870-1894 showing that the effect 

 of rainfall on tho crop is most distinct i 1 dn- years. 



here, the rainfall becomes a limiting factor in those years in which it is 

 unusually low. Thus the years 1882-3, lSS.5-6 and 1890-1, which were 

 years of low rainfall are also characterised by a distinct drop in the 

 sugar production. 



In Trinidad the correlation is still less marked (Fig. 3) for although 

 the highest crops usually appear to have come in years of high total 

 rainfall (1900-1, 190-3-6, 1916-17) yet years of low rainfall may produce 

 quite good crops (1903-4, 1908-9, 1913-14) often indeed well above 

 years of much higher rainfall. 



nrriYxiclo.c\ SuciarGroJj au<i Ro.w\j-all 



[wiH {< ?3 2^ k'5 5-i i"} 7^ M 9-» '9»-ii ll-n llfj '3-H, /»•«■ /S^-H, /f>^l7 j^ 



70 



a 



ifig. 3. 



. 3.— Annual rainfall and sugarcrop in Trinidad 19C0 -191S s'lowinj ab scuce of distinct relatio > between the two. 



