""The Influence of Caffein on Mental and Motor Efficiency"" is a book written by Harry Levi Hollingworth and published in 1912. The book explores the effects of caffeine on both mental and physical performance. Hollingworth conducted a series of experiments on subjects who consumed varying amounts of caffeine and measured their cognitive and motor abilities. The book discusses the results of these experiments in detail, examining the impact of caffeine on attention, memory, reaction time, and other cognitive functions. It also explores the effects of caffeine on physical performance, including endurance and strength. The book is considered a landmark in the study of caffeine and its effects on human performance, and it remains a valuable resource for researchers and anyone interested in the effects of caffeine on the human body and mind.Archives Of Psychology.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.