without Mathematics and the Influence on the Length of the Day Discussed. By T. K. Abbott, B.D., Fellow and Tutor, Trinity College, Dublin. Crown 8vo., 2s.

BALL.—Works by Sir ROBERT S. BALL, LL.D., F.R.S.

ELEMENTS OF ASTRONOMY.

With 130 Figures and Diagrams.

Fcp. 8vo., 6s. 6d.

A CLASS-BOOK OF ASTRONOMY. With 41 Diagrams.

Fcp. 8vo., 1s. 6d.

CLERKE.—THE SYSTEM OF THE STARS. By Agnes M. Clerke. With 6 Plates, and numerous Illustrations. 8vo., 21s.

GOODWIN.—AZIMUTH TABLES FOR THE HIGHER DECLINATIONS. (Limits of Declination 24° to 30°, both inclusive.) Between the Parallels of Latitude 0° and 60°. With Examples of the Use of the Tables in English and French. By H. B. Goodwin, Naval Instructor, Royal Navy. Royal 8vo., 7s. 6d.

HERSCHEL.—OUTLINES OF ASTRONOMY.—By Sir John F. W. Herschel, Bart., K. H., etc. With 9 Plates, and numerous Diagrams. 8vo., 12s.

LOWELL.—MARS. By Percival Lowell, Fellow American Academy, Member Royal Asiatic Society,