In a review of the many issues that have appeared since our last retrospect, it will not be possible to do much more than indicate the main topics of interest to our readers in the various numbers of “Mind.” No. XX. (October, 1880) was in reality a more than usually interesting one. Besides the conclusion of a curious but valuable series of papers on the cell-theory and the “Unity of the Organic Individual,” to which we have referred before, it contained also an elaborate essay on “æsthetic Evolution in Man,” from the prolific pen of Mr. Grant Allen. It is sufficient to say of this that the theory propounded is one of “apanthropinisation;” or, in more intelligible language, the widening out of associations of beauty concentrically from the assumed starting-point in the sexual selection of the most ornamented mate. There is an unimportant essay by W. Davidson on “Botanical Classification”—a subject which has yet to be philosophically treated—and a very important one on Kant, by Professor John Watson, of Canada. Among the Notes are some remarks by Mr. Bain on Mr. Galton's very interesting scheme of mental statistics (previously noticed here), a discussion of “Brute Reason,” and a noteworthy summary of the views lately stated with great clearness by Professor James, of Harvard, as to Muscular Sense and the feeling of effort, hitherto a subject for much loose theorising.