In the twilight of my days I have been tempted to the recitals which follow, and in relating my experiences as the Chief of the Secret Service of the Government during the Rebellion, I have been governed by a desire to acquaint the public with the movements of. Those brave men who rendered luvalo able service to their country, although they never were a uniform or carried a musket. Working quietly, and frequently under diguises, their assist ance to the Union commanders was of incalculable advantage, and many acts of courage and daring were performed by these men which, until now, have never been revealed. Indeed, as to my own made-plum, E. J. Allen, many of the officers of the army and officials of the Government, with whom I was in con stant communication, never knew me by any other 'name, and the majority of them are to this day in ignorance of the fact that E. J. Allen, late Chief of the Secret Service, and Allan Pinkerton are one and the same person.