292 



cox. 



This map shows that there are two definite and different types of 

 rainfall in the Philippines; the western half of the Archipelago has a 

 fairly well defined dry and wet season, and in general the eastern half 

 has a rainfall quite equitably distributed throughout the year. The type 

 of rainfall of the western portion of the Archipelago is shown in figure 

 4 ■^ in which I have represented gi-aphically the mean of the values given 

 in Table IV. Fig. 5 presents the mean values given in Table V and 

 shows the type of rainfall of the eastern portion of the Philippine group. 



360 

 t 

 1^ 320 



i 200 



■<: 

 3: 



^A/V FCB. MAR APR_ HAY JUNE JULY AUG- SEPT OCT. NOV DEC. 



Fig. 4.— Mean rainfall in the western portion of the Philippine Archipelago. 



' A comparison of this with text figures 1 and 2 shows that evaporation for 

 Manila takes place not only in proportion to the duration of the sunshine and 

 in inverse proportion to the cloudy days, but also in inverse proportion to the 

 rainfall, for in the Tropics cloudy days usually represent rain. No data on the 

 evaporation in the Eastern zone are at hand, but this generality probably holds. 

 A uniformly distributed rainfall not only controls the ground moisture by direct 

 addition but also renders evaporation uniform. 



