The Origin of the Wind

This is just like thinking that all rivers are one and the same river. The nature of wind and how it originates, its efficient cause and whence they derive their source should be investigated. We find analogous views about the origin of rivers. It is thought that the water is raised by the sun and descends in rain and gathers below the earth and so flows from a great reservoir. No water at all is generated, but the volume of the rivers consists of the water that is gathered into such reservoirs in winter. Hence, rivers are always fuller in winter than in summer, and some are perennial, others not.