The California Pony Express.St. Joseph, April 4.β-To witners thedeparture of the California pony express last evening, an immense crowd bad gathered around the express office. The bag containing voluminous telegraphic despatches from all parts of the country, for the Sacremento inion and Sau FranciscoBulletin and Aka, 49 letters, 9 privatetelegrams and some papers for San Francisco and intermediate points, was, by thegat*Edlt;IwbiItonstororelt; of i wasrequestor YV. 11. JKusscll, placed upon ^j;0the pony, a spirited bay mare, by Mayor ~ ' * _reat enthusiasm, whenthe- rider mounted and the little bay dashed off at a rapid rate, bearing her burden towards the Golden State,Atchison, April 4.βThe pony expressto San Francisco, made the first forty-fiveteen minutes, and showed no signs of 9e]