THIS admirably printed book deserves description rather than criticism, since the author, in his wide range of personal observation and reading, aptly plays the critic to the views that he successively propounds. With an unnecessary. assumption of modesty, he apologises in his preface for “the clumsiness of a geologist, who is more at home with the hammer than the pen.” We can scarcely believe that one who has tinged even his most serious scientific contributions with the high attraction of literary style can in reality know so little of himself. Almost all the papers in the present volume state a proposition and sustain an argument. There is, perhaps, a lighter one, describing a visit to the Lipari Isles; but even this contains a theoretical explanation of a difficult problem at the end. Yet the book is entirely readable, and will serve to bring to workers in all manner of fields the views of one who holds that nothing terrestrial is foreign to the subject of geology.