Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. This possible difference of interpretation is clearly recognised, however, by M. Binet, and those who are acquainted with the outlines of the theory of the Nancy school, who make so much of suggestion, will be able to see how strong [the case may be made against that point of view. Theories aside, moreover, the reader – be he psychologist, medical man, a mem ber only of the intelligent public – will value the collected resources here presented for the study of the subject and admire the candour and ability with which the author has marshalled them.