To teach by mail is plainly the next step in the development of Columbia's great extension system. The step may not be taken this year or next, but eventually the university will be forced by the pressure upon it to give correspondence courses. The way, in fact, is already being smoothed. The director of the extension division devotes a good part of his annual report to combatting the popular prejudice against teaching by mail, and declares that it is quite possible for a university of the size and prestige of Columbia to carry on such work with dignity. None of the endowed universities are giving correspondence courses, but a large number of the state institutions of the West have found them an admirable method of obtaining popular support. When Columbia finally adopts them and puts them of the same non-money making plane as the rest of its extension courses, there will be no great complaint of any breach of academic etiquette, nor should there be. --Boston Transcript.