Book,  Chapter

1        I,  X    |    north and south continued to retain their normal position as
2        I,  XIII |     satisfaction of seeing them retain their equilibrium.~One phenomenon,
3        I,  XV   |         the old—why does it not retain its old formation? What
4        I,  XVII |      why should it not likewise retain something of its central
5        I,  XXI  | eruptive matter, would no doubt retain their liquid condition long
6       II,  XV   |      that you are determined to retain your two garrisons here
7       II,  XVIII|      that the montgolfier might retain its necessary level. Servadac