Although the original author of this book, Sir Patrick Manson, died since the previous edition was published, not a little of his writing is embodied in this volume. The book has been "drastically" revised, so that it is now about seventy pages shorter than the last edition. The section on medical zoology has been entirely rewritten, and certain formerly obscure diseases have been assigned to their proper groups. There have been added six skeleton maps which show the geographic distribution of various diseases, and ninety-four new illustrations, many of which are in color. The author is to be congratulated on improving a book that was edited so long by his eminent predecessor.