Original (inglés)

CHAPTER I. The Stone Age: its Duration and its Place in Time. The nineteenth century, now nearing its close, has made an indelible impression upon the history of the world, and never were greater things accomplished with more marvellous rapidity. Every branch of science, without exception, has shared in this progress, and to it the daily accumulating information respecting different parts of the globe has greatly contributed. Regions, previously completely closed, have been, so to speak, si