AN ILLUSTRATION SHOWING VARIOUS METHODS OF FLYING AND
SWOOPING 87
ANIMALS OF THE CAMBRIAN PERIOD 90
From Knipe's _Nebula to Man_.
A TRILOBITE 90
Photo: J. J. Ward, F.E.S.
THE GAMBIAN MUD-FISH, PROTOPTERUS 91
Photo: British Museum (Natural History).
THE ARCHÆOPTERYX 91
After William Leche of Stockholm.