This is Volume VIII of thirty-two in a series on Developmental Psychology. Originally published in 1923, the author wites that our knowledge of human instincts and capacities, of the processes of learning and remembering, of mental work and fatigue, and of individual differences and their causes has been much increased in the past score of years. This Briefer Course represents a simpler treatment of the more fundamental subject matter of these volumes, organized as a text-book in Educational Psychology for students in colleges and schools.