From Colorado

Fort Kearney, April 29. The C. 0. C. and P. P. Express passed yesterday, vvith Denver dates to the I5th. Serious apprehensions oí Indiao difficulties are entertained. They can easily cut off all the plains travel and trade. Ooi. Boon, Tndian Agont, sent a courier to Fort. Wi.se on the 14th, with a requisition for two companie.s of caval rv, to hold themselves in reudiness to march for Denver at an hour's notico. - Should indieations continue unfavorable, they will be ordered up very soon. Denver, April 15.- Intense feeling respecting the war in the States prevaila tbrouehonttbia country A sraull eecession flag was displayod by 3 bu siness house hore yesterday evening, butit was so insignifioíintthiit no ootice was taken of it. Union flagg ure waving in many pnrts of the city, and thé Union feeling is almost unanimous. The military expresa to New Mexicín fort haB been discontinued.