The Location of German-American Diplomacy : Convention for the Mutual Abolition of the Droit d'Aubaine and Taxes on Emigration Between the United States of America and his Royal Highness the Duke of Nassau; May 27, 1846 has changed.
http://avalon.law.yale.edu/19th_century/nas1846.asp
You will automatically be transfered there. Or you can click on the link above.