We have just received another important work from the indefatigable and accomplished pen of Professor Osvald Sirén, PH. D., of the Stockholm University. It is a study of Leonardo da Vinci's life and work, a most complete and thorough monograph of 468 pages, magnificently illustrated by hundreds of full-page and smaller reproductions, the majority taken from Leonardo's pictures, sketches and diagrams; the rest are mostly from the works of other painters which throw light upon the special points discussed; there are also some pleasing views of places referred to. The first edition consists of 700 numbered copies, beautifully printed on thick paper, and is in all respects but one a perfect example of what such a book should be; the one thing lacking is an index to the subject-matter and illustrations. This can easily be remedied in the next edition, for there is no doubt that another will immediately be called for, as the work will be invaluable to all lovers of art who wish to read the latest and most complete analysis of Leonardo's career and to learn the results of the most recent research. This edition is, of course, written in Swedish, but we understand that in response to the demand, it will soon appear in other languages, and so be made accessible to a much larger public. Dr. Sirén has spent a long time in Italy and elsewhere studying everything connected with Leonardo and his contemporaries, and this volume is largely the result of his original researches. It has been very favorably received by the most competent Swedish critics. The monograph is founded upon a series of lectures lately given in the University of Stockholm (in which Dr. Sirén occupies the chair of Art-history) and it has been the author's aim to show the great master as he appears in his works and writings, with as little of the "personal equation" of the writer visible as possible--to make Leonardo tell his own story--but at the same time, one cannot help feeling and approving of the warm glow of appreciation which inspires every word Dr. Sirén writes about his hero. His admiration for the master seems to have influenced his style, for there is a greater simplicity and clearness, and a more easy flow of words and sentences than we have observed in previous works from his able pen.