Mr. Motley to Mr. Seward
Sir: The military supplementary convention between that government of Mexico which is here recognized as the legitimate one and the Austrian government was signed on the 15th of this month.
As the nature and conditions of this agreement have already been fully stated in my despatches of January 8, February 20, and February 27, (Nos. 142, 148, and 150,) the matter can be no novelty to you, and there seems no necessity for repeating what has already been said.
It is expected that about 1,000 volunteers will be shipped very soon from Trieste to Vera Cruz, and at least as many more in the autumn.
I have the honor to remain, sir, your obedient servant,
Hon. William H. Seward, Secretary of State.