P. V. N. Myers, A General History for Colleges and High Schools…
“ The battles now being waged in the religious and the political world are only faint echoes of the great battles of the sixteenth, seventeenth, and eighteenth centuries. A new movement of human society has begun. Civilization has entered upon what may be called the Industrial Age, or the Age of Material Progress. The decade between 1830 and 1840 was, in the phrase of Herzog, "the cradle of the new epoch." In that decade several of the greatest inventions that have marked human progress were first brought to practical perfection. ”
