Whitney, Ely, the cotton gin, [436].
Wissler, Clark, culture areas, [26]; trade, [104].
World state, [493].
World war, breaks the barriers of thought, [488].
World War, iconoclastic effects of, [427].
Writing, [181].
Wyclif, John, and the English reformation, [378], [386].
Zeno, [220].
Zenophanes, [220].
Zwingli and the reformation in Switzerland, [385].