Such a wish would have had to remain unsatisfied six years ago, when the _Diätetik des Geistes_ first appeared. It is true, English physicians particularly, like West, Conolly, Maudsley, and others, had a long time previously directed attention to the morbid phenomena of infant psychic life, but their work, like that of their French and German professional associates, lies buried in medical magazines and volumes not easily accessible. The first to apply himself to the work needed in this condition of affairs was Professor EMMINGHAUS, who digested and collected all the material, thus supplied, in a compendious work bearing the title _Die psychischen Störungen des Kindesalters_, Tübingen, Laupp, 1887. The fact indeed is not to be left unrecognised that the book, in so far as it may be used by those who have not had a medical training, possesses two defects,—defects, however, for which the author cannot be censured. In the first place, it is intended for physicians only, and is therefore, on account of the many technical terms it uses, at times not uniformly intelligible. To the serious student, however, who possesses the previous psychological and physiological knowledge most indispensable, it presents no difficulties of too great magnitude. The second defect likewise springs from the purpose of the work. It consists in the fact that, excepting a few occasional references and hints, the pedagogical aspect of the question is not considered. Pedagogists, here, are confronted with a problem which must be solved, and of which the solution will certainly not be a thankless task. The writer of these lines has approached one aspect of this question in a treatise of his entitled _Nervosität and Mädchenerziehung_, Wiesbaden, 1890, in the course of which study he has arrived at the conviction that an important factor is lacking in modern pedagogics and the training of teachers. This conviction he has put into words in another treatise, _Geistesstörungen in der Schule_, Wiesbaden, 1891, with what success it remains for the future to say. Two years after the appearance of Emminghaus’s work a translation was published in Germany of a French book of a similar character. _Der Irrsin im Kindesalter_, by Dr. PAUL MOREAU, authorised edition by Dr. Demetrio Galatti, Stuttgart, 1889, Ferdinand Enke, publisher. Unfortunately, Moreau, as his own preface reveals, did not know, when he wrote his book, of the existence of the German work,—a circumstance that has not been without regrettable consequences. Taken in conjunction with the work of Emminghaus, however, Moreau’s book possesses, on account of the numerous morbid cases it gives, a high value; although it cannot bear comparison with the former work in richness of material and familiarity with the literature of the subject, and much less so in the psychological treatment of the subject, where Emminghaus is incomparably subtler and more profound.