LOCKYER’S ASTRONOMY _ELEMENTS OF ASTRONOMY_: Accompanied with numerous Illustrations, a Colored Representation of the Solar, Stellar, and Nebular Spectra, and Celestial Charts of the Northern and the Southern Hemisphere. By J. NORMAN LOCKYER. _American edition_, revised and specially adapted to the Schools of the United States. _12mo. 312 pages. Price, $1.75._ The volume is as practical as possible. To aid the student in identifying the stars and constellations, the fine Celestial Charts of Arago, which answer all the purposes of a costly Atlas of the Heavens, are appended to the work--this being the only text-book, as far as the Publishers are aware, that possesses this great advantage. Directions are given for finding the most interesting objects in the heavens at certain hours on different evenings throughout the year. Every device is used to make the study interesting; and the Publishers feel assured that teachers who once try this book will be unwilling to exchange it for any other. D. APPLETON & CO., PUBLISHERS, 549 & 551 BROADWAY, NEW YORK. SCIENCE PRIMERS, _edited by_ _PROFESSORS_ HUXLEY, ROSCOE, _and_ BALFOUR STEWART. VI. _PHYSIOLOGY._ [Illustration: EXPLANATION OF THE PLATE. FIG. I.--THE HUMAN SKELETON IN PROFILE. _Mn._ The Mandible or Lower Jaw. _St._ The Sternum. } _R._ The Ribs. } In the Thorax. _R´._ The Cartilages of the Ribs. } _Scp._ The Scapula, or Shoulder Blade. _Cl._ The Clavicle, or Collar Bone. _H._ The Humerus. } _Ra._ The Radius. } In the Arm. _U._ The Ulna. } _F._ The Femur. } _Tb._ The Tibia. } In the Leg. _Fb._ The Fibula. } FIG. II. A front view of the Sternum, _St._, with the Cartilages of the Ribs, _R´._, and part of the Ribs themselves _R._] Science Primers. PHYSIOLOGY. BY M. FOSTER, M.A., M.D., F.R.S., FELLOW OF TRINITY COLLEGE, CAMBRIDGE. WITH ILLUSTRATIONS. NEW YORK: D. APPLETON AND COMPANY, 549 AND 551 BROADWAY. 1877. PREFACE.