Louis McLane to Anthony Butler, 11 June 1834
Mr. McLane to Mr. Butler.
Department of State,
June 11, 1834.
Herewith enclosed, I transmit a duplicate of my No. 58, together with duplicates of the power authorizing you to negotiate an additional article to the treaty of limits, of my letter to the Minister of Foreign Affairs, and of the office copy of the same for yourself.
Whenever the subjects of your communications require the use of the cipher, it is deemed advisable that you should put the whole letter, paragraph, or sentence, in cipher, rather than that a few words in cipher should be followed by a few words in writing; otherwise the object in using the cipher may be defeated; for, to an ingenious person, and especially to one practised in deciphering, the parts in writing might serve as a key to the other parts.
I am, sir, respectfully, your obedient servant,
Anthony Butler, Esq.,
Chargé d'Affaires of the U. S., Mexico.
Enclosed in MVB to the U.S. House of Representatives, 4 July 1838 (HRExdoc 351).