Such speculators rather tend to forget, for instance, that men in the modern world also sometimes make marks in caves. When a crowd of trippers is conducted through the labyrinth of the Marvellous Grotto or the Magic Stalactite Cavern, it has been observed that hieroglyphics spring into sight where they have passed; initials and inscriptions which the learned refuse to refer to any remote date. But the time will come when these inscriptions will really be of remote date. And if the professors of the future are anything like the professors of the present, they will be able to deduce a vast
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