delivered the opinion of the court.
This is a petition for a mandamus requiring the district, judge for the eastern district of New York to compel one Eliza M. Shepherd to obey the command of a subpoena duces tecum, and produce before a special examiner certain iron patterns of an old fire-place heater, that testimony might be taken respecting them, to be certified and used on the hearing of an equity cause pending in the Circuit Court for the Southern District of New York. From the petition it appears that the judge has' already .acted on the idéntical showing made to us, and for reasons assigned in writing denied a motion for an attachment against the person named for refusing to obey the subpoena.
A writ of
mandamus
may be used to compel an inferior tribunal to act on a matter within its jurisdiction, but not to control its discretion while acting
(Ex parte Railway
Company,
Petition denied.
