Originally published in 1930, this book forms part three of a four-volume work by the renowned British meteorologist Napier Shaw (1854-1945). The text focuses on the physical processes of weather, attempting to provide the reader with a grounding in the fundamental aspects of the area. Numerous illustrative figures are included, together with a table of symbols and extensive textual notes. This book will be of value to anyone with an interest in meteorology and the history of science.