There is no other book just like this. Not only does it give the salient facts of structural zoölogy and the development of the various branches of animals, but also the natural history--the _life and habits_--thus showing the interrelations of structure, habit, and environment. In a word, it gives the principles of zoölogy and _their actual application_. The economic phase is emphasized. Part I--the _Field and Laboratory Guide_--is designed for practical instruction in the field and laboratory. To enhance its value for this purpose blank pages are inserted for notes. * * * * * Drew's Invertebrate Zoölogy ~A Laboratory Manual of Invertebrate Zoölogy.~ By GILMAN A. DREW, PH. D., Assistant Director at Marine Biological Laboratory, Woods Hole, Mass. With the aid of Former and Present Members of the Zoölogical Staff of Instructors. 12mo of 213 pages. Cloth, $1.25 net. ~JUST READY--NEW (2d) EDITION~ The subject is presented in a logical way, and the type method of study has been followed, as this method has been the prevailing one for many years. ~Prof. Allison A. Smyth, Jr., Virginia Polytechnic Institute~ "I think it is the best laboratory manual of zoölogy I have yet seen. The large number of forms dealt with makes the work applicable to almost any locality." * * * * * Norris' Cardiac Pathology ~Studies in Cardiac Pathology.~ By GEORGE W. NORRIS, M.D., Associate in Medicine at the University of Pennsylvania. Large octavo of 235 pages, with 85 superb illustrations. Cloth, $5.00 net. ~SUPERB ILLUSTRATIONS~ The wide interest being manifested in heart lesions makes this book particularly opportune. The illustrations are superb and are faithful reproductions of the specimens photographed. Each illustration is accompanied by a detailed description; besides, there is ample letter press supplementing the pictures. Considerable matter of a diagnostic and therapeutic nature has been interwoven. ~Boston Medical and Surgical Journal~ "The illustrations are arranged in such a way as to illustrate all the common and many of the rare cardiac lesions, and the accompanying descriptive text constitutes a fairly continuous didactic treatise." * * * * * McConnell's Pathology ~A Manual of Pathology.~ By GUTHRIE MCCONNELL, M.D., Professor of Bacteriology and Pathology at Temple University, Philadelphia. 12mo of 523 pages, with 170 illustrations. Flexible leather, $2.50 net. ~NEW (2d) EDITION~ Dr. McConnell has discussed his subject with a clearness and precision of style that make the work of great assistance to both student and practitioner. The illustrations have been introduced for their practical value. ~New York State Journal of Medicine~