Washington, Dec. 22.—A handsome granite monument erected in Arlington National Cemetery at the grave of Major General William W. Belknap, who was secretary of war during the administration of President Grant, was to-day turned over to the government. The Monument was erected by General Belknap's comrades of Crocker's Iowa brigade of the army of the Tennesssee, Companions of the Military Order of the Loyal Legion of the United States and other friends.