292 



ZONES AND REGIONS 



[Pt. Ill, Sect. I 



coalescent roots of epiphytic figs or species of Clusia forms often the 

 living coffin within which many a stately tree moulders away. 



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Whilst the demand for light draws vegetation upwards, the need for 

 moisture draws it downwards. Where humidity is decreased, the con- 

 formation of the woody plants becomes massive, the crowns of foliage 



