When historical societies for study and research in Pennsylvania history — local and general — are multi plying all over the State, no apology is needed for writing a book on the subject. Pennsylvania has a history of more than two centuries. It consists, like that 'of the other States which separated from Great Britiain to form the American Union, of a Colonial, a Revolutionary, and a Constitutional period. It has always been a part of another history: first of Eng land, and then of the United States. This is true, not alone in a nominal, but in a real sense. United States history, whether its political, social, or indus trial side, is of a composite nature. Every State helps to make it. The contribution of the thirteen original States is the greatest, because they have a Colonial and 'a Revolutionary history. In Pennsyl vania these periods are especially interesting and im portant, though they have been sadly neglected.
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