Affairs at Norfolk.
Norfolk, Jan. 31.
--The U. S. brig Dolphin is receiving her armament at the Navy-Yard.
It is said she will be moored off the U. States powder magazine at Fort Norfolk.
On Wednesday, an artillery company and a company of light infantry (State troops) went to Fort Norfolk.
The former practised their guns on the beach.
The statement in the New York Herald about the U. S. magazine at Fort Norfolk having been made ready to be blown up by the U. S. authorities, in case of an attempted seizure, is without foundation.