44 EXTINCT “MONSTERS 
that they were the tracks of birds—a view which was not adopted 
by scientific men at the time, though afterwards many came 
round to his opinion. We have perused his work with great 
interest, and cannot but admire the care with which he studied 
Fic. 3.—Portion of a slab of New Red Sandstone, from Turner’s Falls, 
Massachusetts, U.S., covered with numerous tracks, probably of Dinosaurs. 
This specimen is now in the Natural History Museum, London. ‘The separate 
tracks are indicated by the numbers. (After Hitchcock.) 
the tracks and endeavoured to interpret their meaning, although 
his conclusions now require a good deal of modification. 
Professor Hitchcock chose to give fanciful names to the 
creatures that made the tracks, such as Brontozoum giganteum, 
