""On The Variations In The Water Content Of Trees"" is a scientific book written by James Barkley Pollock in 1896. The book explores the fluctuations in the water content of trees, providing a detailed analysis of the factors that affect the water content of trees, including temperature, humidity, and soil moisture. The book also discusses the methods used to measure the water content of trees, such as the use of hygrometers and psychrometers. Pollock's...