Whether, at any subsequent time, he acquired the Frisian dialect, of which " he had not yet heard" when Dr. Tholuck visited him, I am unable to pronounce from any positive information. But I find in his catalogue several volumes in this language (to which it is highly probable that this interview called his attention ;) not merely elementary books, such as Rasck's FriescheSpraaMeer, but historical works, as for instance, Wissers' History, and even such light literature as Japiek's Collection of Frisian Poetry. ^{Note 1} From his known habits I can hardly doubt that, once having acquired these books, he must at least have made some progress towards mastering their contents.  

Notes