The Cecil Whig

How They Predict the Weather at the Smithsonian Institute.--Prof. Henry, at the Scientific Association, gave an account of the method pursued each day at the Smithsonian Institute to record and predict the weather. They have a map of the United States hung upon a board, with pins stuck through at the points where the observers of the Institute are stationed. The Institute has daily reports by telegraph from many of these points. Each morning an assistant hangs a cord on the pins to indicate the state of the weather--black if raining, green if snowing, brown if cloudy, white if fair. All storms travel east, and thus they are enabled to predict with great certainty the condition of the weather, twelve hours in advance.