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In Part I the drags of certain streamline models are compared with the skin friction on thin flat plates having the same exposed surface areas and the same lengths parallel to the direction of motion. For streamline solids of revolution at low Reynolds numbers the drags approximate to the skin friction on flat plates with laminar boundry layer, while for high Reynolds numbers the approximation is to the skin friction with turbulent boundary layer; the transition from the one condition to the other occurs at, roughly, the same Reynolds numbers and in the same manner as for flat plates.