Terb.ible AccrosuT at Gbtttsburg.—Me.Russell 3ML Briggs, of Philadelphia, who went to Gettysburg last week to remove the remains of a son killed in battle, and at the same to witness the dedication of the National Cemetery, met •with a terrible accident on Friday last. He had picked up a shell on the battle-field, and, with the Intention of taking it home with him, un%r-took to remove its contents. He had the captaken oat, and was striking the shell upaftjglfcstone to loosen the powder and thus extra's^the balls, when the missile exploded^ with agttM report, and so horribly mangled his handl|^H require the immediate amputation of both, b^^^lotherwise woanding him. A fragment ofi|S| eh ell also 8truck a boy named Allen Frazer whowas standing near, out bis body nearly in two,and killed him almost instantly.