To four of the dialogues I have with some reluctance prefixed a short running analysis. It is always a pity to anticipate what the author puts clearly before us;[1] but there is here a real practical difficulty, even for a careful reader, in being sure who is the speaker for the time being; and as he is often introduced by the pronouns ‘I’ or ‘he’, no typographical device quite serves. The other dialogues seem to explain themselves sufficiently. There is no attempt to supply a commentary; but it is hoped that the full index of proper names (which are very numerous) will enable a reader to distinguish those as to whom it is worth his while to inquire further from those who are only of passing interest. I have given here a good many references to other works of Plutarch, but more may usefully be sought, for instance in such an index as is appended to Clough’s edition of the _Lives_. I may perhaps be allowed to mention that the dialogue _On the Face which appears on the Orb of the Moon_ was translated by me, and tentatively published in 1911, with the hope of obtaining some helpful criticism. Having received several kind notices, and in particular a very full one in _Hermathena_ by Dr. L. G. Purser, to which I am deeply indebted, I have now ventured to reproduce this dialogue in somewhat fuller form than the others, and to retain some of my original notes. I should add that I have no competence to deal with any scientific matters as such. I have added two longer notes on special points of interest.