MIXED SCHOOLS IN WASHINGTON.—The new public school board of Washington city, organized Monday night. A resolution to revise the school rules and discipline, was referred to a committee of there colored and two white trustees. George W. Dyer, a white member, announced boldly that he was in favor of mixed schools, and no dissent was expressed from his views. The colored members favored the same thing, if the law will carry them out. An effort will be made by the late board to restrain the new board from proceeding further upon the ground that they have not right to break up the public school system.