264 



ZONES AND REGIONS [Pt. Ill, Sect. 



338 cm.: Saigon, 211 cm.; Killing in Formosa, 305 cm. — in Africa 

 Kamerun, 388 cm.; Gabun, 226 cm. ; Sierra Leone, 319 cm. — m Avicrica 

 North-East Jamaica, 281 cm.; Hayti (Sanchez), 206 cm. ; Colon, 289 cm. 

 Georgetown (British Guiana), 214cm.; Paramaribo, 228 cm.; Bahia, 32( 

 cm. ; Santos, 250 cm. — in Australia : Cape York (North Australia), 220 cm, 

 Papeete (Tahiti), 218 cm.; Samoa (Utumapu), 212 cm. At certain spot 

 in the districts of tropical high-forest we find the rainfall as low as abou 

 150 cm., but no lower. Only on the Amazon are rainfalls of 200 cm. aiK 

 more the exception ; there the forest owes its luxuriant growth to th 

 water in the soil, and it consequently does not form an extensive continuou 

 area, but is confined to the river-banks. 



The distribution of precipitation throughout the months of the year ma; 

 be given in millimeters for a few non-Malayan stations in the district of th 

 tropical high-forest : — 



DISTRIBUTION OF THE RAINFALL THROUGHOUT THE MONTHS 

 THE YEAR IN MILLIMETERS IN SOME NON-MALAYAN STATIONS. 



III tropical districts wit It precipitations at all seasons tlic forest is cvcrgrcc 

 and is developed as rain-forest. In districts ivitli a marked dry season ti 

 forest is cither less rich in foliage during the dry season, for instance in Ea 

 Java, or is defoliated like typical monsoon-forest, for instance in the grcati 

 part of Cis-gangetic India. 



The meteorological data at my disposal do not permit of a very preci 

 statement of the conditions that occasion the leaf-fall in the great 

 part of Cis-gangetic India. Besides the distribution of the rain, oth 

 factors certainly intervene, such as quantity of rainfall, temperature, ar 

 humidity of the air. 



DISTRIBUTION OF THE RAINFALL PER MONTH IN MILLIMETER 

 IN CIS-GANGETIC INDIA. 



Ratnagiri on the west coast of Cis-gangetic India, at the foot of the Ghats, 

 situated in a district where the forests are leafless in the dry season. The tal 

 shows that the dry season is far more marked than in the Malaj-an forest-distri 



