slavery."

Mr. Mann proceeded to explain the point at which he was aiming. He had
read these extracts from Mr. Foote's speech, delivered to a
miscellaneous collection of blacks and whites, bond and free, assembled
before the _Union_ office, as showing to what exciting influences the
slaves of the District were exposed, independently of any particular
pains taken by anybody to make them discontented; and, with the same
object in view, he proposed to read some further extracts from other
speeches delivered on the same occasion.

"_District Attorney_.--If this matter is put in as
evidence, it must first be proved that such speeches
were delivered.

"_Mann_.--If the authenticity of the speeches is denied,
I will call the Honorable Mr. Foote to prove it.

"_District Attorney_.--What newspaper is that from which
the counsel reads?

"_Mann_ (_holding it up_).--The Washington _Union_, of
April 19th."

And, without further objection, he proceeded to read some further
extracts.

He concluded by urging upon the jury that this case was to be viewed
merely as an attempt of certain slaves to escape from their masters, and
on my part an attempt to assist them in so doing; and therefore a case