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The present volume is the only full account in English of the physical, physiological, and psychological factors which lie at the basis of the calculation of the range of vision through the atmosphere. There is an extended chapter on instruments and one on the author's own theory of the colours of distant objects.

"This is the first general textbook on the subject in English for more than half a century .... While the book is indispensable for reference for the practising meterorologist, the needs of the student are met by an adequate presentation of theoretical topics."

In 1760 the first edition of the Traite d’optique sur la gradation de la lumiere of Pierre Bouguer was published posthumously. Dr. Middleton’s translation is accompanied by explanatory notes and a biographical and critical introduction.