Fort Kearney, June 2. The Pony Express poseed yeBterday vvith San Francisco dates of May 2öth. Steamer St. Louis sailed for Panama on the 21it, with eighty passengere and $09,000 in treasure. The arrival of tho Btearfcr St. Louis and Pony Express vvilh news to the 18th, slightly jncouraged the disposition to ship treasure. Exchange ruled at 6 per cent. premium, but sume leading bankers were not selling. The municipal election in San Francisco, on the 21st, resulted in the triumph ol the People's Union ticket by ai average majority of tifteen. The contest was very exciting, business béng generaily suspended to give everyjody an opportunity to participate. Five hundred picked men had been enrolled for Lippet's volunteer regiment, including one company of h'ght artillery from companies of intantry. When the regiment is full its service will be tendered to the general government. A lieutenant of the Army iad been detailed by Gen. Suraner, to act as Adjutant, and is novv superinending army driils. The Legislature adjourned on the 6th. Advices froin Oregon to the 19th of Vlav, says : Uuion meetings were being ield throughout tho State. The Dallas Mountainecr rejects the proposition to cali a Democratie State Convention in üregon, and farors one without disiootioD ol party.