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The most remarkable aspect of this lecture is that it is terminated directly the chief problem is enunciated, and that it consists mainly in a statement of the situation, that the chief interest attaching to the subject of mental development is that it takes place, individually, racially, and phylogenetically. But why it should do so at all, and how it does so, on these points we gain no satisfying information. It is the similarity of human reactions to specified stimuli, allowing them to be arranged in groups, which offers the greatest interest to the author, rather than the individual differences in mental development causing various reactions to the given stimulus.
The zeal of the experimental psychologist no doubt offers extensive gratification to the innate sadism of the operator, but it seems carrying