Our secretary of state is our minister of foreign affairs, and is the only officer who is authorized to communicate with other governments in the name of the president. He is at the head of the diplomatic and consular service, issuing the instructions to our ministers abroad, and he takes a leading part in the negotiation of treaties. To these ministerial duties he adds some that are more characteristic of his title of secretary. He keeps the national archives, and superintends the publication of laws, treaties, and proclamations; and he is the keeper of the great seal of the United States. [Sidenote: Diplomatic and consular service.] Our foreign relations are cared for in foreign countries by two distinct classes of officials: ministers and consuls. The former represent the United States government in a diplomatic capacity; the latter have nothing to do with diplomacy or politics, but look after our commercial interests in foreign countries. Consuls exercise a protective care over seamen, and perform various duties for Americans abroad. They can take testimony and administer estates. In some non-Christian countries, such as China, Japan, and Turkey, they have jurisdiction over criminal cases in which Americans are concerned. Formerly our ministers abroad were of only three grades: (1) "envoys extraordinary and ministers plenipotentiary;" (2) "ministers resident;" (3) _chargés d'affaires_. The first two are accredited by the president to the head of government of the countries to which they are sent; the third are accredited by the secretary of state to the minister of foreign affairs in the countries to which they are sent. We still retain these grades, which correspond to the lower grades of the diplomatic service in European countries. Until lately we had no highest grade answering to that of "ambassador," perhaps because when our diplomatic service was organized the United States did not yet rank among first-rate powers, and could not expect to receive ambassadors. Great powers, like France and Germany, send ambassadors to each other, and envoys to inferior powers, like Denmark or Greece or Guatemala. When we send envoys to the great powers, we rank ourselves along with inferior powers; and diplomatic etiquette as a rule obliges the great powers to send to us the same grade of minister that we send to them. There were found to be some practical inconveniences about this, so that in 1892 the highest grade was adopted and our ministers to Great Britain and France were made ambassadors.