In a tropical rain forest near San Carlos de Rio Negro. Venezuela, average yearly precipitation from September 1, 1975, through August 31, 1977 was 3664 mm. Throughfall was 87% of precipitation, stem flow was 8%, transpiration was 47%, evaporation from leaf sur· face-:: was 5%, and sub-surface runoff was 48% . These results conform closely to the prediction of Marques et ai. (1977) that 48% of the precipitation that fal ls 0'1 the central Amazon Basin ls derived from evapotransoiration within the Basin.

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