Chapter

1 XXV   |   getting accustomed to the density of the atmosphere, we don’
2 XXV   | perfectly.”~“But won’t this density augment?”~“Yes; according
3 XXV   |     air at last acquire the density of water?”~“Of course, under
4 XXV   |     still?”~“Lower down the density will still increase.”~“But
5 XXVIII|    velocity. Even increased density air has no effect upon its
6 XXX   |   no doubt due to the great density of the air.~The word cavern
7 XXXV  |    having once reached this density, to become final?~We are