“When two writers of marked ability in both literature and natural history unite to produce a work giving scope to their special talents, the public has reason to expect a masterpiece of its kind. In the ‘Citizen Bird,’ by Mabel O. Wright and Dr. Elliott Coues, this expectation is realized—seldom is the plan of a book so admirably conceived, and in every detail so excellently fulfilled.”—_The Dial._ “There is no other book in existence so well fitted for arousing and directing the interest that all children feel toward the birds.”—_Tribune_, Chicago. Flowers and Ferns _In their Haunts_ By MABEL OSGOOD WRIGHT _New Edition, cloth, 12mo, $2.00 net_ The subjects are treated in their relation to landscape—the whole bound together with a thread of narrative. The book thus has the fascination of romance, yet no better handbook could be found for the study of the flowers in their natural surroundings. There are over 50 full-page plates of the flowers where they live and grow, along the roadside, in wood or by river. In addition to these plates, there are over 100 illustrations in the text, made direct from photographs by the author and by J. H. McFarland. A Text-book on the Principles of Animal Histology By ULRIC DAHLGREN, M.S., Assistant Professor of Biology in Princeton University; and WILLIAM A. KEPNER, A.B., Adjunct Professor of Biology in the University of Virginia _Cloth, 515 pp., 8vo, $3.75 net_ “The name of the senior author alone leads us to expect much from this volume, and the most careful scrutiny reveals almost no defects. It easily takes first place among histologies, chiefly because of the invaluable comparative element. With few exceptions, histologies, intended as they have been primarily for the medical student, have heretofore been based for the most part on the genus _Homo_. Morphologists and anatomists will welcome a general histology which in the widest sense holds to its title, treating its subject as a pure science.... One can scarcely imagine a clearer or better arranged text-book either for the general student or for the specialist in any of the many related sciences. Since scientists in many fields often have occasion to refer to or to verify some point in histology, the volume will appeal to readers outside of the domain of histology proper.”—_New York Evening Post._ “In marked contrast to practically all the text-books of histology in the English language, which deal largely or exclusively with human or mammalian structures, this new book discusses the tissues of all classes of animals. It is therefore possible to treat the subject much more broadly and satisfactorily than has hitherto been done.”—_American Journal of Science._