At the point where Booth crossed the Potomac the shores are very shallow, and one must wade out some distance to where a boat will float. A white man came up here with a canoe on Friday, and tied it by a stone anchor. Between seven and eight o'clock it disappeared, and in the afternoon some men at work in Virginia, saw Booth and Harold land, tie the boat's rope to a stone, and fling it ashore, and strike at once across a ploughed field for King George Court House. Many folks entertained them without doubt, but we positively hear of them next at Port Royal Ferry, and then at Garrett's farm. I close this article with a list of all who were at Garrett's farm on the death of Booth. 1. E. J. Conger, \ Detectives. 2. Lieut. Baker, / 3. Surgeon from Port Royal, 4. Four Garrett daughters. 5. Harold, Booth's accomplice, _Soldiers_.--Company H, Sixteenth New-York Volunteer Cavalry, Lieutenant Ed. P. Doherty commanding: Corporals A. Neugarten, J. Waly, M. Hornsby: Privates J. Mellington, D. Darker, E. Parelays, W. Mockgart; Corporals--Zimmer (Co. C), M. Taenaek; Privates H. Pardman, J. Meiyers, W. Burnn, F. Meekdank, G. Haich, J. Raien, J. Kelly, J. Samger (Co. M), G. Zeichton,--Steinbury, L. Sweech (Co. A), A. Sweech (Co. H), F. Diacts; Sergeant Wandell; Corporals Lannekey, Winacky; Sergeant Corbett (Co. L). Sergeant Corbett, who shot Booth, was the only man of the command belonging to the same company with Lieutenant Doherty, Commandant. LETTER VI. THE DETECTIVES' STORIES. Washington, May 2--P. M. The police resources of the country have been fairly tested during the past two weeks. Under the circumstances, the shrewdness and energy of both municipal and national detectives have been proven good. The latter body has had a too partial share of the applause thus far, while the great efforts of our New-York and other officers have been overlooked. In the crowning success of Doherty, Conger, and Baker on the Virginia side of the water we have forgotten the as vigorous and better sustained pursuit on the Maryland side. Yet the Secretary of War has thanked all concerned, especially referring to many excellent leaders in the long hunt through Charles and St. Mary's counties. Here the military and civil forces together amounted to quite a small army, and constituted by far the largest police organization ever known on this side of the Atlantic. I think the adventures and expedients of these public servants worthy of a column. It would be out of all proportion to pass them by when we devote a dozen lines to every petty larceny and shoplifting.