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

WORKS BY RICHARD A. PROCTOR-— Continued. 
THE STARS IN THEIR SEASONS: an Easy Guide to a 
Knowledge of the Star-Groups. In 12 Large Maps. Imperial 8vo., 55. 
ROUGH WAYS MADE SMOOTH. Familiar Essays on 
Scientific Subjects. Crown 8vo., 35. 6d. 
PLEASANT WAYS IN SCIENCE. Crown 8vo., 3s. 6d. 
NATURE STUDIES. By R. A. Procror, Grant ALLEN, A. 
WI1son, T. FosTEeR, and E. CLODD. Crown 8vo., 35. 6d. 
LEISURE READINGS. By R. A. Procror, E. Ciopp, A. 
WILSON, T. FOSTER, and A. C. RANYARD. Crown 8vo., 35. 6d. 

PHYSIOGRAPHY AND GEOLOGY. 
BIRD.—Works by CHARLES BIRD, B.A. 
ELEMENTARY GEOLOGY. With Geological Map of the 
British Isles, and 247 Illustrations. Crown 8vo., 2s. 6d. 
ADVANCED GEOLOGY. A Manual for Students in Advanced 
Classes and for General Readers. With over 300 Illustrations, a Geological 
Map of the British Isles (coloured), and a set of Questions for Examination. 
Crown 8vo., 75. 6d. 
GREEN.—PHYSICAL GEOLOGY FOR STUDENTS AND 
GENERAL READERS. By A. H. GREEN, M.A., F.G.S. With 236 Illus- 
trations. 8vo., 215. ; 
MORGAN.—Works by ALEX. MORGAN, M.A., D.Sc., F.R.S.E. 
ELEMENTARY PHYSIOGRAPHY. Treated Experimentally. 
With 4 Maps and 243 Diagrams. Crown 8vo., 25. 6d. 
ADVANCED PHYSIOGRAPHY. With 215 Illustrations. 
Crown 8vo., 45. 6d." 
THORNTON.—Works by J. THORNTON, M.A. 
ELEMENTARY PRACTICAL PHYSIOGRAPHY. 
Part I. With 215 Illustrations. Crown 8vo., 25. 6d. 
Part II. With 98 Illustrations. Crown 8vo., 2s. 6d. 
ELEMENTARY PHYSIOGRAPHY: an Introduction to the 
Study of Nature. With 13 Maps and 295 Illustrations. With Appendix on 
Astronomical Instruments and Measurements. Crown 8vo., 25. 6d. 
ADVANCED PHYSIOGRAPHY. With 11 Maps and 255 
Illustrations. Crown 8vo., 45. 6d, 
