SEPTEMBER 26TH.—Had a conversation with the Secretary to-day, on the policy of sending Union men out of the Confederacy. I told him we had 15,000 sick in the hospitals at Manassas, and this intelligence might embolden the enemy to advance, capture the hospitals, and make our sick men prisoners. He said such prisoners would be a burden to them, and a relief to us. I remarked that they would count as prisoners in making exchanges; and to abandon them in that manner, would have a discouraging effect on our troops. He said that sending unfriendly persons out of the country was in conformity with the spirit of the act of Congress, and recommended me to reperuse it and make explanations to the people, who were becoming clamorous for some restriction on the egress of spies.