"In 1715," replied the unknown, "the astronomers Louville and Halley mistook for lunar phenomena some which were purely terrestrial, such as meteoric or other bodies which are generated in our own atmosphere. This was the scientific explanation at the time of the facts; and that is my answer now."
"On again, then," replied Ardan; "Herschel, in 1787,observed a great number of luminous points on the moon's surface, did he not?"