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.