ASTRONOMY, NAVIGATION, ETC.

ABBOTT.—ELEMENTARY THEORY OF THE TIDES: the Fundamental Theorems Demonstrated 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.

DE CAMPIGNEULLES.—OBSERVATIONS TAKEN AT DUMRAON, BEHAR, INDIA, during the Eclipse of the 22nd January, 1898, by a Party of Jesuit Fathers of the Western Bengal Mission. By the Rev. V. de Campigneulles, S.J. With 14 Plates. 4to., 10s. 6d. net.

GILL.—TEXT-BOOK ON NAVIGATION AND NAUTICAL ASTRONOMY. By J. Gill, F.R.A.S., late Head Master of the Liverpool Corporation Nautical College. 8vo., 10s. 6d.

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