Thus let the freshest and most prominent object in the school-room aid the teacher and superintendent, through the use of the eye, in their great work. A word of caution is needed, however, concerning the use of the blackboard. Sometimes it has been made to appear quite ridiculous by a fanciful and perverted use of it. The only justifiable use of the blackboard in a Sabbath-school is in order to make Bible truths more clear and attractive in the eyes of teachers and scholars. Men of good taste, as well as those having tact and ingenuity, can and do use the blackboard with power in various ways. For instance, some years ago I saw a lesson taught in Ralph Wells's school--and many of my examples originated with him--from the text in Matt. v. 16: "Let your light so shine," etc. This was plainly written on the board, while on one side was drawn a figure of a light-house, with the rays of light shining forth from the lamp. The superintendent in a review pressed the question, "_How_ are we to let our light shine, according to the lesson, 'So shine?'"--and very soon the children said they were to let their light shine by "being pure," "meek," "merciful," etc., and soon the beatitudes were each written on the separate rays from the light-house lamp. At another time I noticed the text, "Founded on a rock," together with the figure of a house firm on a rock, and another house crumbling and falling down "on the sand." See to the foundation. A catechism lesson on the question, "What is sin?" was placed on the board "_My sin._" _Examples of Blackboard Exercises._ The following examples are given as suggestive of several different lines of use to which the blackboard may be put: The substance of a lesson in the 6th chapter of Matthew was once put upon the board in two words, "Outside" and "Inside," the children being asked to examine the chapter and tell what to write on the blackboard; at the end of the address the board appeared as follows, each specification having been vividly illustrated by an incident: _Outside._ _Inside._ Alms. Alms. Prayer. Prayer. Fasting. Fasting. Treasures. Treasures. Another good lesson on the board is to take one of the commandments, for instance, the "Third Commandment." Raise three questions and get the children to fill out the answers as follows: _The Third Commandment._ _How broken._ _Why broken._ _Why not._ Swearing. Get mad. 'Tain't right. Oh gracious! Don't think. No use. Make fun of the Bible. Think its big. Bible says we mustn't. Praying careless. Careless. Mean. Singing and not thinking. Wicked. Ungentlemanly. The following lesson has been successfully given by the Rev. Mr. Ostrander, of Albany: