x CONTENTS. 



J'AQK 



INFLUENCE OF MARRIAGE ON THE DEATH-RATE . . 238 



THE TOPOGRAPHICAL SURVEY OF INDIA 244 



A SHIP ATTACKED BY A SWORD-FISH 256 



THE SAFETY-LAMP 259 



THE DUST WE HAVE TO BREATHE 265 



PHOTOGRAPHIC GHOSTS 267 



THE OXFORD AND CAMBRIDGE BOWING STYLES . . . 269 



BETTING ON HORSE RACES: OR, THE STATE OF THE ODDS 274 



SQUARING THE CIRCLE . 288 



A NEW THEORY OF ACHILLES' SHIELD . . 297 



