that is closed to him. The further extension of this method of
presentation is urged upon the teacher, so that the young
geologist may always learn the evidence that leads to a
conclusion, and not only the conclusion itself.

W. M. DAVIS

HARVARD UNIVERSITY, CAMBRIDGE, MASS.

JULY, 1905





CONTENTS

INTRODUCTION.--THE SCOPE AND AIM OF GEOLOGY

PART I

EXTERNAL GEOLOGICAL AGENCIES

I. THE WORK OF THE WEATHER
II. THE WORK OF GROUND WATER
III. RIVERS AND VALLEYS
IV. RIVER DEPOSITS
V. THE WORK OF GLACIERS
VI. THE WORK OF THE WIND
VII. THE SEA AND ITS SHORES