Mexico, 10th August, 1858.. 363 Do. Convention. British Claims.* Guatemala, 25th November, 1861.. 1187 Great Britain. Convention. Postal. Assumption, 1st August, 1860.. 1027 Russia. Agreement. Commerce and Navigation. Frankfort, 20th December, 1852.. 1089 Paraguay, &c. Treaty. Friendship, Commerce, |