ILLUSTRATIONS 



DIAGRAM TO ILLUSTRATE ARISTARCHUS MEASUREMENT 

 OF THE RELATIVE DISTANCES FROM THE EARTH OF 



THE MOON AND THE SUN Facing p. 2l8 



DIAGRAM TO ILLUSTRATE ERATOSTHENES* MEASURE- 

 MENT OF THE GLOBE " 230 



DEVICE FOR CAUSING THE DOORS OF THE TEMPLE TO 



OPEN WHEN THE FIRE ON THE ALTAR IS LIGHTED 246 



THE STEAM-ENGINE OF HERO " 248 



THE SLOT-MACHINE OF HERO " 250 



PLINY 254 



PTOLEMY 268 



GALEN . . " 280 



