Originally published in 1942, this title was recognised as setting new standards in the scientific approach to speech problems. Much speech therapy in the past had been unsatisfactory because of its emphasis upon the purely mechanical aspects of the condition, while at the same time the purely psychological approach was not sufficient to lead to satisfactory and radical treatment either. In this title the author combines the two approaches and by setting out the basic pathology of the various conditions, he throws new light upon them. Today it can be read and enjoyed in its historical context.