"Regarding the primitive type of mental organization among these natives,--despite Darwin's first opinion of them, which was subsequently modified, I consider these people inherently intelligent, though of a very primitive type as far as their culture is concerned, probably the most primitive in this hemisphere, perhaps in the world, as the Onas are today living in the Stone Age. Dr. E. Von Hornbostel of Berlin University, who has collaborated with me in making a special study of my phonographic records of their songs, informs me that these songs are the most primitive American-Indian songs of which they have any record." Of importance for a clear understanding of the mental traits of these Indian tribes, as the source from which these attacks develop, are the study of their dreams, their system of taboos and their myths. So far as could be determined from the data supplied, the dreams of these primitive races strongly resemble the dreams of children, as these aboriginal tribes possess many childlike attributes. In fact up to a certain age the civilized child is really a little savage, with his strong egotism and feelings of rivalry, his taboos, his jealousies and his few or no altruistic tendencies. In the child as in the savage, the wish and the thought are synonymous, both want their desires immediately gratified, although such gratification may be impossible in reality. The dreams of the Yahgan Indians are simple wish fulfilments, without disguise or elaboration, like the dreams of a civilized child.