On Tuesday morning they presented themselves at the Port Royal ferry, and inquired of the ferry-man, while he was taking them over in squads of seven at a time, if he had seen any two such men. Continuing their inquiries at Port Royal, they found one Rollins a fisherman, who referred them to a negro named Lucas, as having driven two men a short distance toward Bowling Green in a wagon. It was found that these men answered to the description, Booth having a crutch as previously ascertained. The day before Booth and Harold had applied at Port Conway for the general ferry-boat, but the ferryman was then fishing and would not desist for the inconsiderable fare of only two persons, but to their supposed good fortune a lot of confederate cavalrymen just then came along, who threatened the ferryman with a shot in the head if he did not instantly bring across his craft and transport the entire party. These cavalrymen were of Moseby's disbanded command, returning from Fairfax Court House to their homes in Caroline county. Their captain was on his way to visit a sweetheart at Bowling Green, and he had so far taken Booth under his patronage, that when the latter was haggling with Lucas for a team, he offered both Booth and Harold the use of his horse, to ride and walk alternately. In this way Lucas was providentially done out of the job, and Booth rode off toward Bowling Green behind the confederate captain on one and the same horse. So much learned, the detectives, with Rollins for a guide, dashed off in the bright daylight of Tuesday, moving southwestward through the level plains of Caroline, seldom stopping to ask questions, save at a certain halfway house, where a woman told them that the cavalry party of yesterday had returned minus one man. As this was far from circumstantial, the party rode along in the twilight, and reached Bowling Green at eleven o'clock in the night. This is the court-house town of Caroline county--a small and scattered place, having within it an Ancient tavern, no longer used for other than lodging purposes; but here they hauled from his bed the captain aforesaid, and bade him dress himself. As soon as he comprehended the matter he became pallid and eagerly narrated all the facts in his possession. Booth, to his knowledge, was then lying at the house of one Garrett, which they had passed, and Harold had departed the existing day with the intention of rejoining him.