When you honoured me with an invitation to lecture at Clark University, a wish was expressed that I should speak about my methods of work, and especially about the psychology of childhood. I hope to accomplish this task in the following manner:— In my first lecture I will give to you the view points of my association methods; in my second I will discuss the significance of the familiar constellations; while in my third lecture I shall enter more fully into the psychology of the child. I might confine myself exclusively to my theoretical views, but I believe it will be better to illustrate my lectures with as many practical examples as possible.