80 EXTINCT MONSTERS. 
well as the length of stride they indicate, is against the idea of 
their having been made by birds. Some of them, for instance, are 
twenty inches in length, and four or five feet apart! The foot of 
the African ostrich is but ten inches long, so we must fall back on 
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Fic. 14.—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. The separate tracks 
are indicated by the numbers. (After Hitchcock.) 
the Dinosaurs for an explanation. However, it is quite possible 
that some of the smaller impressions were made by birds. 
There is at South Kensington a fine series of these and other 
specimens of fossil footprints (Gallery No. XI., Wall-cases 8-10). 
The surface of one large slab in the geological collection is eight 
