20 Scientific Works published by Longmans, Green, & Co. 

ASTRONOMY, NAVIGATION, ETC. 
ABBOTT._ELEMENTARY THEORY OF THE TIDES: 
the Fundamental Theorems Demonstrated without Mathematics and the In- 
fluence on the Length of the Day Discussed. By T. K. ABBort, 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 Dia- 
grams. Fep. 8vo., 65. 6d. 
A CLASS-BOOK OF ASTRONOMY. With 41 Diagrams. 
Fep. 8vo., ts. 6d. 
GIZLL.—TEXT-BOOK ON NAVIGATION AND NAUTICAL 
ASTRONOMY. By J. GILL, F.R.A.S., late Head Master of the Liverpool 
Corporation Nautical College. 8vo., ros. 6d. 
GOODWIN.—AZIMUTH TABLES FOR THE HIGHER 
DECLINATIONS. (Limits of Declination 24° to 30°, both inclusive.) 
Between the Parallels of Latitude o° 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 JouHn 
F. W. HERSCHEL, Bart., K.H., etc. With 9 Plates and numerous Diagrams. 
8vo., I25. - 
LAUGHTON.—AN INTRODUCTION TO THE PRAC- 
TICAL AND THEORETICAL STUDY OF NAUTICAL SURVEYING. 
By JOHN KNOx LAUGHTON,M.A.,F.R.A.S. With 35 Diagrams. Crown 8vo., 6s. 
LOWELL.—MARS. By PeErcivaL LowELL, Fellow American 
Academy, Member Royal Asiatic Society, Great Britain and Ireland, ete. 
With 24 Plates. 8vo., 125. 6d. 
MARTIN.—NAVIGATION AND NAUTICAL ASTRONOMY. 
Compiled by Staff Commander W. R. MARTIN, R.N. Royal 8vo., 18s. 
MERRIFIELD.—A TREATISE ON NAVIGATION. For 
the Use of Students. By J. MERRIFIELD, LL.D., F.R.A.S., F.M.S. With 
Charts and Diagrams. Crown 8vo., 5s. 
PARKER.—ELEMENTS OF ASTRONOMY. With Numerous 
Examples and Examination Papers. By GEORGE W. PARKER, M.A., of 
Trinity College, Dublin. With 84 Diagrams. 8vo., 55. 6d. net. , 
WEBB.—CELESTIAL OBJECTS FOR COMMON TELE- 
SCOPES. By the Rev. T. W. Wess, M.A., F.R.A.S. _ Fifth Edition, 
Revised and greatly Enlarged by the Rev. T. E. Espin, M.A., F.R.A.S. (Two 
Volumes.) Vol. I., with Portrait and a Reminiscence of the Author, 2 Plates, 
and numerous Illustrations, Crown 8vo., 6s. Vol. II., with numerous Illustra- 
tions. Crown 8vo., 6s. 6d. 
