WORKS BY CHARLES DARWIN. 



OBIGIN OF SPECIES BY MEANS OF NATURAL SELEC- 

 TION, or the Preservation of Favored Races in the Struggle for Life. New 

 edition, from the latest English edition, with additions and corrections 

 Cloth. . . . • 1.25 



DESCENT OF MAN, and Selection in Relation to Sex. With illustrations. 

 New edition, revised and augmented. Cloth. . . . 1.56 



FORMATION OF VEGETABLE MOULD THROUGH THE 

 ACTION OF JFOR3IS, with Observations on their Habits. With 

 illustrations. Cloth. . . . . . . 75 



CHARLES DAR WIN : His Life and Work, by Grant Allen. Cloth. .75 



SELECT WORKS OF GRANT ALLEN, Containing : 



THE EVOLUTIONIST AT LARGE, 

 VIGNETTES FROM NATURE, and 

 FORCE AND ENERGY, A Theory of Dynamics. 



Three books in one vol. Cloth. . . . . .1.00" 



WATER, ELECTRICITY AND LIGHT, BY PROFESSOR JOHN 

 TYNDALL. Containing : 



FORMS OF WATER IN CLOUDS AND RIVERS, Ice and Glac 



iers. 19 illustrations. 

 LESSONS IN ELECTRICITY. 60 Illustrations 

 SIX LECTURES ON LIGHT. Illustrated. 



Three books in 1 vol. Cloth. . . . . .1.00 



WORKS BY HERBERT SPENCER. 



THE DATA OF ETHICS. Cloth .60^ 



EDUCATION, Intellectual, Moral and Physical. 

 PROGRESS : Its Law and Cause. With other disquisitions. 



Two books in one vol. Cloth. . . . . . .75 



THE GENESIS OF SCIENCE. 



THE FACTORS OF ORGANIC EVOLUTION. 



Two books in one vol. Cloth. . . . . . .75 



SELECT WORKS OF RICHARD A. PROCTOR. F.R.A.S.: 



LIGHT SCIENCE FOR LEISURE HOURS. 



FAMILIAR ESSAYS ON SCIENTIFIC SUBJECTS, 



HEREDITARY TRAITS, and other Essays. 



MISCELLANEOUS ESSAYS. 



ILLUSIONS OF THE SENSES, and other Essays. 



NOTES ON EARTHQUAKES, with fourteen miscellaneous Essays. 



Six books in one vol. ...... 1.5C 



SELECT WORKS OF WILLIAM KINGDON CLIFFORD, F.R.A.S., 



containing ; 



SEEING AND THINKING. 



THE SCIENTIFIC BASIS OF MORALS, and other Essays. 

 CONDlflONS OF MENTAL DEVELOPMENT, and other Essays. 

 THE UNSEEV UNIVERSE, and the Philosophy of the Pure Sciences. 

 COSMIC EMOTION: ALSO THE TEACHINGS OF SCIENCE, 

 Five books in one vol. Cloth. ..... 1.25 



