77. It is to this latter circumstance that the Panorama is principally indebted for its magical effects.
78. Sir David Brewster has enumerated various extraordinary illusions, which may be thus produced, in his Work on Natural Magic.
79. Ovid’s Metamorphoses, 10.
81. From the French term courant, signifying running.
83. A scientific critic has offered the following just remark upon this passage. “The rocket ascends by a constantly acting force, not by a momentary impulse, as though it were shot from a gun. Supposing the force arising from combustion to be proportionate to the weight of the rocket, as long as the force continues to be generated, the rocket must move in a straight line; after which, having only its own momentum to oppose its gravitation, it will proceed in a parabolic curve.”