"It can't be filled with air, or nothing, and my ray would not illuminate air or nothing.

I cannot understand it.

If you did not see what I see, I should think I was going crazy." "Don't talk that way," exclaimed Margaret.

"This may be some cavity which the ray will soon pass through, and then we shall come to the good old familiar rock again." But Clewe could not be consoled in this way.

He could see no reason why his ray acting upon the emptiness of a cavern should produce the effect he beheld.