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Sir,	U. S. Naval Observatory, 4th February 1858.

I have the honour to acknowledge the receipt of your communication of the 29th ultimo, enclosing a commission making me a Commander in the Navy from the 14th day of September, 1855.

Respectfully, &c.,

M. F. Maury, Commander, U.S.N.

To Hon. Isaac Toncey,

Secretary of the Navy.