We would not undertake to conduct a Sabbath-school without a good blackboard. The great object of it is to direct, to concentrate, and to _fix_ the attention, sympathies, and prayers of the whole school upon that portion of the word of God which is embodied in the great practical thought of the lesson. It is affectingly interesting to see a whole school, teachers and scholars, banishing their worldly thoughts, and raising their eyes and hearts apparently up to the great warm thought of God, as they cross the threshold of the school-room, and see, in clear, distinct letters on the blackboard, the key-note of the lesson for the day; as, "My son, give me thy heart." "Son, go work to-day in my vineyard." "The soul that sinneth, it shall die." "I will arise and go to my father." "Have faith in God." "All waiting for Jesus." "Flee from the wrath to come." "About my Father's business." "The blood of Jesus Christ his Son cleanseth us from all sin." "Founded on a rock," etc. Blackboards have long been used in public schools with great advantage, but have only been adopted in Sunday-schools during the last decade of years. They, however, prove to be so well adapted and useful that they are meeting with universal approval, and are fast coming into general use. We think a blackboard should be used in every Sabbath-school, on every Sabbath, by every superintendent, and on every lesson; for the dullest superintendent, in city or country, can plainly write or print one thought from the word of God on the blackboard, and thus fix the eye and concentrate the thought and heart of the otherwise careless, upon the lesson. We have often seen the noisiest boys of the city calmed by this means into thoughtfulness and interest in the lesson. Sometimes colored crayons are used to attract as well as to impress. The names of the Deity are sometimes carefully written in crayon of one color, while wrath, sin, etc., may be put in another color, say _red_. A map, drawn by the superintendent or pastor on the blackboard in the presence of the school, will have many times the effect that it will have, if we point to a regular map. A cross of two rough marks made by a teacher on a slip of paper, to illustrate the lesson, will interest a child more than will a jewelled cross,--it was made by teacher. Frequently the superintendent or teacher will write down the answer, or the main word of the _answers_ of the children on the blackboard, and this will interest them greatly. A teacher can use a piece of white paper to write or draw on for the scholars of a private class. A few points must be heeded-- 1. Do not put any but well-digested, important words, thoughts, and objects on the blackboard. 2. Write or draw as plainly, neatly, and correctly as possible. Do not write too much. 3. Let all the exercises of the school bear directly towards the one great thought of the lesson.