KEY AND INDEX 



optician. About 1590 placed a concave and a 

 convex lens respectively at the end of a tube, 

 and used this device for magnifying small ob- 

 jects. This is the first recorded instance of the 

 use of a compound microscope. 



Jenner, Edward, iv, 190. Born at Berkeley, 

 England, May 17, 1749; died there Jan. 26, 1823. 

 English physician, the discoverer of vaccination. 

 In investigating the disease known as cowpox, 

 he discovered that after inoculation by this dis- 

 ease the patient was immune from smallpox. 

 This was the basis of his discovery probably 

 the greatest in medicine previous to his time, 

 and for about two generations following. 



Joule, James Prescott, iii, 269. Born at Sal- 

 ford, England, Dec. 24, 1818; died at Sale, Oct. 

 n, 1889. English physicist. One of the first 

 to expound the doctrine of the conservation of 

 energy. His paper "On the Calorfic Effects of 

 Magneto-electricity, and the Mechanical Value 

 of Heat" was published in 1843. Tyndall be- 

 lieved that Joule and Mayer were equally en- 

 titled to the credit of this revolutionary dis- 

 covery. 



Jussieu, Antoine and Bernard, de, ii, 303. An- 

 toine, born at Lyons, France, April 12, 1748; 

 died at Paris, Sept. 17, 1836. Bernard, born at 

 Lyons, France, Aug. 17, 1699; died at Paris, 

 Nov. 6, 1776. Two celebrated French botanists, 

 who founded the natural system of the classifica- 

 tion of plants. By some authorities the credit 

 of this classification is given to Bernard. 



Kadmus (or Cadmus), i, 86. In Greek legend 

 he is reported to have introduced the letters of 



[116] 



