Discusses pressure distribution on buildings. Describes wind tunnel tests on model buildings. Pressure distribution on walls were measured in a constant velocity field and in anartificially produced velocity gradient. Discusses results and deduces rules by which pressure distribution and wind loads can be predicted for buildings in any specified wind field. Changes in the flow pattern due to the velocity distribution were observed and correlated with the pressure distribution. On the front surfaces an intense downward flow carrying high energy air to ground level was observed on tall buildings and on low structures a region of reversed flow at ground level resulted in an attached eddy.