f) > . f 
r*’**«’% 
&'V 
¥. Koppen ( 
/ 
^ / ^W : 
) approaches the matter/from the oceanographic facts. 
He says, 11 As an explanation we can deduce here only the strip of cold wa 
water which (probably sucked up from the depths by the strong westerly 
stream in the southeast trades) runs from the Oalapagos along the equa¬ 
tor almost (but not quite) to these islands. The great variability in 
amounts of rainfall may be conditioned by the shifting of MM& cold- 
water and warm-water surface8 
f j a ) 
c> 
Enoch stated that while the strikingly low annual average, is suresto 
he connected with the temperature of the sea water, fee/does not consider 
that explanation satisfactory for the hihh variations in precipitation, and 
:xins±Easi relate! this to wind direction and constancy instead. 
