When I started working on this book, I meant to compile a textbook on physical meteorology for senior students, the need for which has been felt for many years in England. At the same time, I hope that this book is useful for specialist meteorologists. I tried to give the fullest possible concept of theoretical meteorology, especially the physical side of it, as it corresponds to the current state of our knowledge in this field. Where theory does not yet explain observable phenomena, such as the general circulation of the atmosphere and moving cyclones and anticyclones, I limited myself to descriptions of observable phenomena, providing them with such theoretical remarks that could facilitate the understanding of these phenomena.