OF 



THE HUMBOLDT LIBRARY 



OF 



Price 15 cents a number. Double Numbers, 30 cents. 



No. 1. Light Science for Leisure Hours. A series of familiar essays 



on astronomical and other natural phenomena. By Richard A. 



Proctor, F.R.A.S. 

 No. 2. Forms of Wafer in Clouds and Rivers, Ice and Glaciers. (19 illus 



trations). By John Tyndall, F.R.S. 

 No. 3. Physics and Politics. An application of the principles of Natural 



Science to Political Society. By Walter Bagehot, Author of 



"Tiie English Constitution." 

 No. 4. 3Ian's Place in Nature, {with numerous illustrations). By 



Thomas H. Huxley, F.R.S. 

 No. 5. J5JrZy/c«<ioj«, Intellectual, Moral and Physical. By Herbert SPENCEa. 

 No. 6. Town Geology. With Appendix on Coral and Coral Reefs. By 



Rev. Charles' Kingsley. 

 No. 7. TJie Conservation of Energy, {ivith numerous illustrations). By 



Balfour Stewart, LL.D. 



No. 8. The Study of Languages, brought back to its true principleB. 

 By C. Marcel. 



No. 9. Tlie Data of Ethics, By Herbert Spencer. 



No. 10. The Theory of Sotiti d in its Relation to Music, {numerous 



illustrations). By Prof. Pietro Blaserna. 

 No. 11. ) The Naturalist on the River Amazons. A record of 11 yegjrs 

 No. 12. f of travel. By Henry Walter Bates, F.L.S. {Not sold separately). 

 No. 13. Mind and Body. The theories of their relations. By Alkx. 



Bain, LL.D. 



No. 14. The Wonders of the Heavens, {thirty-two illustrations). By 

 Camille Flammarion. 



No. 15. Longevity. The means of prolongf'ug life after middle age. By 



John Gardner, Jt.D. 

 No. 16. The Origin of Sj^ecies. By Thomas H. Huxley, F.R.S. 

 No. 17. Progress : Its Law and Cause. With other disquisitions. By 



Herbert Spencer. 



No. 18. Lessons in Electricity, {sixty illustrations). By John Tvt*. 

 OAU.. F.R.S. 



No. 19. Familiar Essays on Scientifie Subjects. By Richard A. 



Proctor. 

 The Rotnance of Astronomy. By R. Kalley Miller, M.A. 

 The Physical Basis of Life, with other essays. By Thomas H. 



Huxley, F.R.S. 

 Seeing and Thinking. By William Kingdon Clifford, F.R.S. 

 Scientific Sophisms. A review of current theories concerning 



Atoms, Apes and Men. By Samuel Wainwright, D.D. 

 Popular Scientific Lectures, (illustrated). By Prof. H. Helm- 



holtz. 

 Tfe« Origin of Nations, By Prof. Geo. Rawlinson, Oxford Unir. 

 The Evolutionist at Large, By Grant Allen. 

 The History of Landholding in England, By Joseph 



Fisher, F.R.H.S. 

 No. 28. Fashion in Deformity , as illustrated in the customs of Barbarous 



and CiviUzed Races. {Numerous illustrations). By William 



Henry Flower, F.R.S. 



