Book,  Chapter

1        I,  IX  |     therefore, not only upon ascertaining the extent of the late catastrophe,
2        I,  IX  | coast.~They were not long in ascertaining that on the farther side
3        I,  XI  |      lose the opportunity of ascertaining whether the submarine ridge
4        I,  XII |  terrestrial matters, and in ascertaining what changes had taken place
5       II,  III |     the circumference; so in ascertaining the elements of a comet,
6       II,  VI  |  unless he had the means for ascertaining the precise measurement
7       II,  XIII|    but with the intention of ascertaining whether the subterranean