“It is hardly an exaggeration to summarize the history of four hundred years by saying that the leading idea of a conquering nation in relation to the conquered was, in 1600, to change their religion; in 1700, to change their trade; in 1800, to change their laws, and in 1900 to change their drainage. May we not, then say that on the prow of the conquering ship in these four centuries first stood the priest, then the merchant, then the lawyer, and finally the physician?”