Another easy way to use the blackboard--still without venturing on drawing--is by constructing diagrams. What a key to Scripture chronology, for instance, is furnished your scholars when you draw a horizontal line to represent the four thousand years from Adam to Christ, bisect it for Abraham, bisect the last half for Solomon, bisect the third quarter for Moses, and continue to bisect as long as a famous man stands at the bisecting-point! How it clears up the life of Christ to draw two circles, the inner one for Jerusalem, the outer for Nazareth, dividing them into thirty-three parts for the years of our Saviour's life, and running a curved line in and out according as his journeys took him to Nazareth and beyond its circle, or back to Jerusalem at the feast-times! Such circles will also serve to depict graphically Paul's missionary journeys, the outer circle representing Antioch. Any series of historical events may well be strung along a vertical line divided into decades, and parallel series, as in the history of the northern and southern kingdoms, along two parallel verticals. An outline map, such as the teacher may draw from memory, will furnish an excellent basis for another kind of diagram, the progress of persons or of series of events being traced from place to place by dotted lines, a different color for each person or journey or group of incidents. Acrostics furnish still another use for the blackboard. For example, draw out from the class by questions a list of the prominent characteristics of David. He was Daring Active Vigilant Inspired Dutiful Not until the list is completed does the class see that its initial letters spell David's name. You have attained the element of surprise, so valuable in work of this sort. Again, in a lesson on the rich young man, or on Dives and Lazarus, or on Zaccheus, write in a vertical column the letters of Christ's name, and draw straight lines to the right in various directions, as shown in the following diagram. Transferring the letters, or getting some scholar to transfer them, to the points indicated, you quickly insert an E, and it reads: "Christ--richest." [Illustration] The application is obvious, and will never be forgotten. Often, in seeking for such an effective presentation of a lesson's truth, we hit upon alliteration, and then our blackboard work is easy. Three P's: P P P Fill them out, as the lesson proceeds, thus: harisee ompously P Prayed P ublican enitently And often, again, our form will be based upon similar terminations or beginnings of words, such as: { choosing Solomon { reigning { sinning Suggestions and examples of such work might be indefinitely multiplied. It is one of the easiest, yet one of the most effective, methods of fixing the points of a lesson.