The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Navies. 30 vols. Washington, DC: Government Printing Office, 1874-1922. Reprint, Gettysburg, PA: National Historical Society, 1971.
I like to hang 0.9% NS to gravity when possible because I always thought that the fluids would stop infusing if the IV site blows. A co-worker of mine disagrees and said that IV fluids hung to gravity would continue to flow and infiltrate if an IV site blows.
You can also divide IV fluids into isotonic intravenous fluids, hypertonic intravenous fluids and hypotonic intravenous fluids. Isotonic IV fluids are those which remain between the cells in blood vessels; hypertonic fluids pull liquid from the cells, and hypotonic fluids go into cells.