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Harper's Encyclopedia of United States History (ed. Benson Lossing) 2 0 Browse Search
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Harper's Encyclopedia of United States History (ed. Benson Lossing), Discoveries of the nineteenth century. (search)
Discoveries of the nineteenth century. Alfred Russell Wallace, in his book, The wonderful century, makes a comparison between the great inventions and discoveries of the nineteenth century and those of the entire previous historical period, which is as follows: Of the nineteenth century. 1. Railways. 2. Steamships. 3. Electric telegraphs. 4. The telephone. 5. Lucifer matches. 6. Gas illumination. 7. Electric lighting. 8. Photography. 9. The phonograph. 10. Rontgen rays. 11. Spectrum analysis. 12. Anesthetics. 13. Antiseptic surgery. 14. Conservation of energy. 15. Molecular theory of gases. 16. Velocity of light directly measured, and earth's rotation experimentally shown. 17. The uses of dust. 18. Chemistry, definite proportions. 19. Meteors and the meteoritic theory. 20. The Glacial Epoch. 21. The antiquity of man. 22. Organic evolution established. 23. Cell theory and embryology. 24. Germ theory of dise