Adieu! As all the accounts which I receive of you grow better and better, so I grow more and more affectionately, Yours. LETTER XLIX LONDON, September 5, O. S. 1748. DEAR BOY: I have received yours, with the inclosed German letter to Mr. Gravenkop, which he assures me is extremely well written, considering the little time that you have applied yourself to that language. As you have now got over the most difficult part, pray go on diligently, and make yourself absolutely master of the rest. Whoever does not entirely possess a language, will never appear to advantage, or even equal to himself, either in speaking or writing it. His ideas are fettered, and seem imperfect or confused, if he is not master of all the words and phrases necessary to express them. I therefore desire, that you will not fail writing a German letter once every fortnight to Mr. Gravenkop; which will make the writing of that language familiar to you; and moreover, when you shall have left Germany and be arrived at Turin, I shall require you to write even to me in German; that you may not forget with ease what you have with difficulty learned. I likewise desire, that while you are in Germany, you will take all opportunities of conversing in German, which is the only way of knowing that, or any other language, accurately. You will also desire your German master to teach you the proper titles and superscriptions to be used to people of all ranks; which is a point so material, in Germany, that I have known many a letter returned unopened, because one title in twenty has been omitted in the direction.