The book Forests and Trees of Karnataka - A Journey in Time through Buchanan's Eyes attempts at providing a pen picture of the forests and trees of Karnataka as seen by Dr. Francis Buchanan during his journey undertaken in 1800 and 1801. As Buchanan's narrations contained in his three-volume journal 'A Journey from Madras through the Countries of Mysore, Canara and Malabar (1807)' cover a wide range of subjects, his observations specifically on trees and other plants have been culled out with a view to visualizing the forest scenario of Karnataka more than 200 years ago. The book also highlights the important role trees were assigned in the distant past to complement agricultural operations and industrial activities leading to economic development and general welfare. Buchanan in his writings had underscored the ingenious ways through which the farmer, with the help of trees and other plants, conserved water, increased soil organic content and improved soil fertility. In fact there was an intrinsic relationship between water, agricultural crops, and the sylvan surrounding. Among the messages which Buchanan's writings convey, the most pertinent one for the present times is perhaps that of the ancient wisdom of the farmer that the surest way to keep the earth cool is to keep it green.