390 



NINETEENTH CENTURY. PT. in. 



CHAPTER XXXVII. 



SCIENCE OF THE NINETEENTH CENTURY (CONTINUED). 



Sir Humphry Davy Laughing-gas Safety-lamp, 1815 Electrolysis 

 Nicholson and Carlisle Faraday John Dalton Law of Mul- 

 tiple Proportions Atomic Theory Meta-elemcrits Liquefaction 

 of permanent Gases Liebig Organic Chemistry Aniline Dyes. 



Sir Humphry Davy, 1778-1829. We saw in the last 

 chapter how Oersted, Davy, Ampere, Faraday, and Seebeck, 

 by their various discoveries, showed the connection between 

 Electricity, Magnetism and Heat. We must now learn how 

 the connection between electricity and chemical change was 

 also worked out. This was done by Sir Humphry Davy 

 and Faraday, who thus put England once more at the head 

 of chemical discovery, in which the French school of Lavoisier 

 had so long taken the lead. 



Sir Humphry Davy, whom we have mentioned before as 

 making experiments upon heat, was born in 1778, at Pen- 

 zance, in Cornwall, and died at Geneva in 1829. His 

 mother being a widow, he was apprenticed when quite young 

 to an apothecary, and there with wine glasses, old medicine 

 bottles, tobacco pipes, and a syringe, he made his first 

 chemical experiments. When he was scarcely twenty years 

 of age, Dr. Beddoes, a physician, who had opened a hospital 

 for curing patients by the use of different gases, heard so 

 much of the young man's abilities that he invited him to 

 come to Bristol, where he employed him in making experi- 

 ments. 



