HABITING THE FOREST TRACT OF THE GABOON IN
AFRICA (_Coloured Illustration_) 158

"DARWIN'S POINT" ON HUMAN EAR 160

PROFESSOR SIR ARTHUR KEITH, M.D., LL.D., F.R.S. 161
Photo: J. Russell & Sons.

SKELETONS OF THE GIBBON, ORANG, CHIMPANZEE, GORILLA, MAN 161
After T. H. Huxley (by permission of Messrs. Macmillan).

SIDE-VIEW OF SKULL OF MAN AND GORILLA 164

THE SKULL AND BRAIN-CASE OF PITHECANTHROPUS, THE JAVA
APE-MAN, AS RESTORED BY J. H. MCGREGOR FROM THE SCANTY
REMAINS 164

SUGGESTED GENEALOGICAL TREE OF MAN AND ANTHROPOID APES 165

THE GIBBON IS LOWER THAN THE OTHER APES AS REGARDS ITS
SKULL AND DENTITION, BUT IT IS HIGHLY SPECIALIZED IN THE
ADAPTATION OF ITS LIMBS TO ARBOREAL LIFE 166
Photo: New York Zoological Park.

THE ORANG HAS A HIGH ROUNDED SKULL AND A LONG FACE 166
Photo: New York Zoological Park.

COMPARISONS OF THE SKELETONS OF HORSE AND MAN 167
Photo: British Museum (Natural History).

A RECONSTRUCTION OF THE JAVA MAN (_Coloured Illustration_) 168

PROFILE VIEW OF THE HEAD OF PITHECANTHROPUS, THE JAVA
APE-MAN--AN EARLY OFFSHOOT FROM THE MAIN LINE OF MAN'S
ASCENT 170
After a model by J. H. McGregor.

PILTDOWN SKULL 170
From the reconstruction by J. H. McGregor.

SAND-PIT AT MAUER, NEAR HEIDELBERG: DISCOVERY SITE OF THE
JAW OF HEIDELBERG MAN 171
Reproduced by permission from Osborn's
_Men of the Old Stone Age_.

PAINTINGS ON THE ROOF OF THE ALTAMIRA CAVE IN NORTHERN
SPAIN, SHOWING A BISON AND A GALLOPING BOAR (_Coloured
Illustration_) 172

PILTDOWN MAN, PRECEDING NEANDERTHAL MAN, PERHAPS 100,000 TO
150,000 YEARS AGO 174
After the restoration modelled by J. H. McGregor.

THE NEANDERTHAL MAN OF LA CHAPELLE-AUX-SAINTS 175
After the restoration modelled by J. H. McGregor.

RESTORATION BY A. FORESTIER OF THE RHODESIAN MAN WHOSE
SKULL WAS DISCOVERED IN 1921 176-177

SIDE VIEW OF A PREHISTORIC HUMAN SKULL