Page:Popular Science Monthly Volume 66.djvu/145

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are those of an unknown tongue, the meaning of which is an enigma unless one has the key. The earlier students attempted to decipher the footprints by comparing them with animals then known, with the

PSM V66 D145 Restoration of the new windsor dinosaur.png

Restoration of the New Windsor Dinosaur.
The probable maker of the tracks on the Middletown slab.

result that they thought they recognized the impressions of batrachians, reptiles, birds and mammals; in fact every group of creatures which were

PSM V66 D145 Carnivorous dinosaur tracks in high relief preserved in stone.png

The Middletown Slab covered with the Footprints of Carnivorous Dinosaurs.
The tracks are in high relief.

capable of making tracks. It will be seen at once that the only true key to these nature's hieroglyphics would be actual skeletal remains associated with the footprints or, if found elsewhere, in beds of equivalent age.