ILLUSTRATIONS 



EARLIEST PICTURE KNOWN OF A SURGICAL OPERA- 

 TION. EGYPT, 2500 B.C 6 



ST. THOMAS AQUINAS OVERCOMING AVERROES . % 54 



DR. GILBERT SHOWING HIS ELECTRICAL EXPERIMENTS 

 TO QUEEN ELIZABETH AND HER COURT .... 72 



THE TICHONIC QUADRANT 88 



WADHAM COLLEGE, OXFORD 104 



SIR ISAAC NEWTON . 112 



JOHN DALTON COLLECTING MARSH GAS .... 162 



THE FIRST SUCCESSFUL HEAVIER-THAN-AIR FLYING 

 MACHINE . 236 



