📒 Originally published in 1911, this early works is a Comprehensive Exposition of the Nature of Mental Fatigue, of the Methods of its Measurements and of Their Results, with Special Reference to the Problems of Instruction. Many of the earliest books, particularly those dating back to the 1900's and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.