CREATE TABLE table_80066 ("Representative" TEXT, "Title" TEXT, "Presentation of Credentials" TEXT, "Termination of Mission" TEXT, "Appointed by" TEXT)

What's the Representative listed that has a Presentation of Credentials of August 25, 1851?
SELECT "Representative" FROM table_80066 WHERE "Presentation of Credentials" = 'august 25, 1851'
SELECT "Representative" FROM "table_80066" WHERE "Presentation of Credentials" = 'august 25, 1851'