In 1894 I was at the meeting of the British Association at Oxford, and had the good fortune to hear Professor Julius Kollmann give his paper on "Pygmies in Europe," in which he described the skeletons which had then recently been discovered near Schaffhausen. As I listened to his account of these small people, whose average height was about four and a half feet, I recalled the description of Irish fairies given to me by an old woman from Galway, and it appeared to me that our traditional "wee-folk" were about the size of these Swiss dwarfs. I determined to collect what information I could, and the result is given in the following pages. I found that the fairies are, indeed, regarded as small; but their height may be that of a well-grown boy or girl, or they may not be larger than a child beginning to walk.