More than 5,250,000 people have been contributed to our population by Germany in the last ninety years. Deducting the Poles from eastern Prussia, and counting Germans from Russia, Austria, Bohemia, and eastern Switzerland, we have, no doubt, received more than 7,000,000 whose mother-tongue was the speech of Luther and Goethe. It is probable that German blood has come to be at least a fourth part of the current in the veins of the white people of this country, so that this infusion alone equals the total volume of Spanish and Portuguese blood in South America. From its rise in the thirties until after our Civil War, the stream of immigrants from Germany fluctuated with religious and political conditions on the other side of the Atlantic rather than with economic conditions on this side. Between 1839 and 1845 numerous Old Lutherans, resenting the attempt of their king to unite the Lutheran and the Reformed faiths, migrated hither from Pomerania and Brandenburg. The political reaction in the German states after the revolution of 1830, and again after the revolution of 1848, brought tens of thousands of liberty-lovers. In 1851, in a book of advice to intending immigrants, Pastor Bogen of Boston set forth as the chief inducement to migrate the _freedom_ the Germans would enjoy in America--freedom from oppression and despotism, from privileged orders and monopolies, from intolerable imposts and taxes, from constraint in matters of conscience, from restrictions on settling anywhere in this country of "exhaustless resources." The political exiles famous as the "Forty-eighters" included many men of unusual attainments and character, who almost at once became leaders of the German-Americans, exercising an influence quite out of proportion to their numbers. These university professors, physicians, journalists, and even aristocrats, aroused many of their fellow-countrymen to feel a pride in German culture, and they left a stamp of political idealism, social radicalism, and religious skepticism which is slow to be effaced.