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 in his Princeton laboratory that he made his epochal discoveries in electricity, stepping-stones to the revolution of the world by its use; in 1848 he was made director of the Smithsonian Institute. In 1846 was organized a Law School; its three professors were men of the highest distinction, but the project was premature. In 1855 flames destroyed all but the walls of Nassau Hall, whereupon it was speedily remodelled as it still stands; the variation, slight as it was from the original, appears to have been in the interest of economy rather than beauty.

The only serious check in Princeton's prosperity was caused by the Civil War. Though a large proportion of the students had always come from the Southern States, the rest were enthusiastic in their Northern sympathies, and the national flag was hoisted by them over Nassau Hall in April, 1861. The minority tore it down, but it was promptly restored to its place by a gallant citizen of the town, who in climbing to the apex of the cupola twisted the shaft of the weather-vane and fixed the arrow with its head to the north. Thus it remained until conciliation was complete a few years since (1896), when the pivot was