CONTENTS. xxvii 



Electric Current by means of a Magnet Seebeck discovers 

 Thermo-Electricity, or the production of Electricity by Heat 

 Schwabe discovers Periodicity of the Spots on the Sun 

 Sabine suggests a connection between Sun-spots and Magnetic 

 phenomena This proved in 1859 by Observations of Carring- 

 ton and Hodgson Electric Telegraph Wheatstone Cooke 

 Steinheil Morse Bain Cowper's Telegraph The Tele- 

 phone . 367 



CHAPTER XXXVII. 



SCIENCE OF THE NINETEENTH CENTURY (CONTINUED). 



Davy discovers that Nitrous Oxide produces Insensibility Laugh- 

 ing-gas Safety-lamp, 1815- Nicholson and Carlisle -discover 

 Decomposition of Water, 1 800 Davy discovers the effect of 

 Electricity upon Chemical Affinity Faraday's Discoveries in 

 Electrolysis Indestructibility of Force Various Modes dis- 

 covered of Decomposing Substances John Dalton, chemist 

 Law of Definite Proportions Law of Multiple Proportions 

 Dalton's Atomic Theory Meta-elements Liquefaction of per- 

 manent Gases The Study of Organic Chemistry Liebig, the 

 great teacher in Organic Chemistry Discovery of Aniline Dyes 390 



CHAPTER XXXVIII. 



SCIENCE OF THE NINETEENTH CENTURY (CONTINUED). 



The Organic Sciences are too difficult to follow out in detail 

 Jussieu's Natural System of Plants Sprengel on fertilisation 

 of Plants by insects Robert Brown on embryological botany 



Sir W. Hooker Goethe proves the Metamorphosis of 



Plants . . . . 411 



CHAPTER XXXIX. 



SCIENCE OF THE NINETEENTH CENTURY (CONTINUED). 



Humboldt studies the Lines of Average Temperature on the Globe 

 Extends our knowledge of Physical Geography Writes the 



