CONTENTS. xxi Pages 3 [3. Ancient lore of mountains..... xxxi 323. Erroneous beliefs about views from high points . xxxi 325. A military mountain-climb..... xxxii 328-335- Ancient signals....... xxxii 335> 336 Measurement of mountains..... xxxii 338. Ptolemy........ xxxii 341, 342. Ptolemy's error about the length of the habitable world........ xxxii 346. The Indian Ocean a lake..... xxxiii 352. The land route to China..... xxxiii 352. The Nile and the Mountains of the Moon . . xxxiv SELECT BIBLIOGRAPHY........ xxxv INDEX..........371—387