On some later occasion, I hope to discuss in detail the various problems of German-Polish relations which Professor Hans Rothfels raised in his article “Frontiers and Mass Migrations in Eastern Central Europe” (The Review of Politics, January 1946).

Immediately, however, I should like to clear up the misunderstandings which might arise in connection with two quotations which Professor Rothfels took out of the context of my own publications.

1. Recalling that in 1226 the duke of Mazovia called upon the help of the Teutonic Order, and stressing that he did it “apparently in despair,” Professor Rothfels adds the following footnote (p. 43, n . 43) :

“En désespoir de cause,” as Professor O. Halecki puts it correctly (La Pologne de 963 à 1914, Paris, 1933, p. 47). Other Polish historians have tried to minimize this fact.