Summary
The formation of "cumulus esfarrapadus" type clouds in areas covered by tropical forest in the Amazon Basin is the observeable evidence of the interference of this type of vegetation cover in the progression of the hydrologic cycle. Starting with direct and sensible observation of the phenomenon, it is concluded that a certain percentage of rainwater evaporates before hitting the ground; foliar transpiration and evaporation of rainwater before attaining the soil being, therefore, the normal forms of increased atmospheric humidity that Involve the tropival forest. The process of cloud formation of the type "cumulus esfarrapadus" is theoretically deduced, to await quantitative data to confirm its validity.