Postal Union, [233]

"Prairie Ground," American display at London Exhibition of 1851, [126]

Prairies, need of Reapers to harvest on the, [65], [73];
uncultivated before advent of Reaper, [67]

Prairie States, ten, [230]

Presbyterian Church, [158], [185], [186]

Princeton University, [172]

Protestant Reformation, [156], [185]

Proudhon, [1], [51]

Publicity, Cyrus H. McCormick believed in policy of, [81]

Puddling-furnace, [17]