This well-known book, originally published in 1903, has undergone some revision and addition at the hands of Dr. Thouless, and its usefulness has been increased thereby. But in spite of this, its value as an elementary text-book is probably inferior (except in the one point of condensation) to the author's larger Manual of Psychology, and to the advanced student it is of course much less attractive than the author's less widely read but in many ways very profound work on Analytic Psychology published in 1896. The additions introduced into the present book do not include any treatment of psycho-analytic findings.