On being introduced by Hon. B. K. BRUCE, on the occasion of the twenty-third anniversary of the abolition of slavery in the District of Columbia, FREDERICK DOUGLASS spoke as follows: FRIENDS AND FELLOW-CITIZENS: Your committee of arrangements were pleased to select me as your orator of the day, on an occasion similar to this, two years ago. At that time, while appreciating the honor conferred upon me, I ventured to express the wish that some one of the many competent colored young men of this city and District had been chosen to discharge this honorable duty in my stead. There were excellent reasons for that wish then, and there are even much better reasons for the same wish now. Time and cultivation have largely added to the number of those from whom a suitable selection might have been made, and one of these silent, yet powerful, agents whose mission it is to create and destroy all things mortal has left me much less desire for such distinguished service now than two years ago. Happily, however, the burden is not heavy or grievous, and the proper story of this occasion is simple, familiar, and easily told. In observing the anniversary of the abolition of slavery in the District of Columbia, we attract the attention of the American people to one of the most important and significant events in their national history, and at the same time evince a grateful and proper sense of the wonderful changes for the better that have taken place in our condition, and in that of the country generally. Though in its immediate and legal operation this act of emancipation was local in its range as to territory, and limited in its application as to the number of persons liberated by it, morally it looms upon us as a grand, comprehensive, and far-reaching measure.