CT-READING SPECTROSCOPE 49
By A. Hilger, Ltd.

CHARLES DARWIN 56
Photo: Rischgitz Collection.

LORD KELVIN 56
Photo: Rischgitz Collection.

A GIANT SPIRAL NEBULA 57
Photo: Lick Observatory.

METEORITE WHICH FELL NEAR SCARBOROUGH AND IS NOW TO BE SEEN
IN THE NATURAL HISTORY MUSEUM 57
Photo: Natural History Museum.

A LIMESTONE CANYON 60
Reproduced from the Smithsonian Report, 1915.

GEOLOGICAL TREE OF ANIMALS 61

DIAGRAM OF AMOEBA 61

A PIECE OF A REEF-BUILDING CORAL, BUILT UP BY A LARGE
COLONY OF SMALL SEA-ANEMONE-LIKE POLYPS, EACH OF WHICH
FORMS FROM THE SALTS OF THE SEA A SKELETON OR SHELL OF
LIME 64
From the Smithsonian Report, 1917.

A GROUP OF CHALK-FORMING ANIMALS, OR FORAMINIFERA, EACH
ABOUT THE SIZE OF A VERY SMALL PIN'S HEAD 65
Photo: J. J. Ward, F.E.S.

A COMMON FORAMINIFER (POLYSTOMELLA) SHOWING THE SHELL IN
THE CENTRE AND THE OUTFLOWING NETWORK OF LIVING MATTER,
ALONG WHICH GRANULES ARE CONTINUALLY TRAVELLING, AND BY
WHICH FOOD PARTICLES ARE ENTANGLED AND DRAWN IN 65
Reproduced by permission of the Natural History Museum
(after Max Schultze).

A PLANT-LIKE ANIMAL, OR ZOOPHYTE, CALLED OBELIA 68
Photo: J. J. Ward, F.E.S.

TRYPANOSOMA GAMBIENSE 69
Reproduced by permission of _The Quart. Journ. Mic. Sci._

VOLVOX 69

PROTEROSPONGIA 69

GREEN HYDRA 72
Photo: J. J. Ward, F.E.S.

DIAGRAM ILLUSTRATING THE BEGINNING OF INDIVIDUAL LIFE 72

EARTHWORM 72
Photo: J. J. Ward, F.E.S.

GLASS MODEL OF A SEA-ANEMONE 72
Reproduced from the Smithsonian Report, 1917.

THIS DRAWING SHOWS THE EVOLUTION OF THE BRAIN FROM FISH TO
MAN