JUNE 21ST.—A large, well-proportioned gentleman with florid complexion and intellectual face, who has been whispering with Col. Bledsoe several times during the last week, attracted my attention to-day. And when he retired, Colonel B. informed me it was Bishop Polk, a classmate of his and the President’s at West Point. He had just been appointed a major-general, and assigned to duty in the West, where he would rank Gen. Pillow, who was exceedingly unpopular in Adjutant-Gen. Cooper’s office. I presume this arose solely from mistrust of his military abilities; for he had certainly manifested much enthusiasm in the cause, and was constantly urging the propriety of aggressive movements with his command. All his purposed advances were countermanded. The policy of the government is to be economical of the men. We have but a limited, the enemy an inexhaustible number.