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 number of very vivid and interesting things from these cave-writings of the twentieth century. If I know anything about the breed, and if they have not fallen away from the full-blooded confidence of their fathers, they will be able to discover the most fascinating facts about us from the initials left in the Magic Grotto by ’Arry and ’Arriet, possibly in the form of two intertwined A’s. From this alone they will know (1) That as the letters are rudely chipped with a blunt pocket-knife, the twentieth century possessed no delicate graving-tools and was unacquainted with the art of sculpture. (2) That as the letters are capital letters, our civilisation never evolved any small letters or anything like a running hand. (3) That because initial consonants stand together in an unpronounceable fashion, our language was possibly akin to Welsh or more probably of the early Semitic type that ignored vowels. (4) That as the initials of ’Arry and ’Arriet do not in any special fashion profess to be religious symbols, our civilisation possessed no religion. Perhaps the last is about the nearest to the truth; for a civilisation that had religion would have a little more reason.