SO far, these talks have analyzed the material at our disposal for the compilation and writing of the history of international relations. The present talk, being the conclusion and summary of the series, takes a special instance in the European history of the nineteenth century with a view to studying how we should set to work' to put together such an historical account. The instance taken, as a critical point in nineteenth century history, is the Congress of Berlin in 1878, and the test to be applied is Disrae!i's claim that ho came back from Berlin bringing ' peace with honour.'