Range of Capacity in the Human and Simian Brains.
Skull from Borreby in Denmark.
Conclusions of Professor Huxley.
Bearing of the peculiar Characters of the Neanderthal Skull
on the Hypothesis of Transmutation.


CHAPTER 6.

PLEISTOCENE ALLUVIUM AND CAVE DEPOSITS WITH FLINT IMPLEMENTS.

General Position of Drift with extinct Mammalia in Valleys.
Discoveries of M. Boucher de Perthes at Abbeville.
Flint Implements found also at St. Acheul, near Amiens.
Curiosity awakened by the systematic Exploration of the
Brixham Cave.
Flint Knives in same, with Bones of extinct Mammalia.
Superposition of Deposits in the Cave.
Visits of English and French Geologists to Abbeville and Amiens.


CHAPTER 7.

PEAT AND PLEISTOCENE ALLUVIUM OF THE VALLEY OF THE SOMME.

Geological Structure of the Valley of the Somme and of the
surrounding Country.
Position of Alluvium of different Ages.
Peat near Abbeville.
Its animal and vegetable Contents.