Owing to the time it takes to complete a problem or task on the sand table, often but one group can use it in an evening. The size of the group working should not, however, be increased. Only small parties can be advantageously instructed. For this reason the sand table must be worked to the limit and because of this and the number of things to be taught on it and because some officers are not very expert in forming suitable terrain on the sand table, it is an advantage to have the relief map also. The latter can then be used for patrolling and work of covering detachments and the sand table for the field engineering. [Sidenote: Brush work] At most stations small twigs can be collected and used to make hurdle revetments, fascines and gabions for use on the sand table. They can be constructed to the reduced scale and this brush work learned nearly as well as outside with normally sized faggots. Have the officer or non-commissioned officer best qualified give the instruction in each class. The instructor has much to do with success; some are specially good at one thing but poor at another. With such a course of instruction well given throughout the year and with a week or ten days of good camp work annually, and suitable school work for the officers, there is no reason why the national guard should not possess the efficiency required of it to be a valuable military asset. [Sidenote: No callisthenic drill] Sufficient of the callisthenic or setting up exercises for the proper development of the soldier should be shown the recruit and the latter told of the advantages of practicing them for a few minutes every morning or evening, or both. Tell him what it will do for his health and appearance and urge him to get busy. There is no use drilling these exercises in the armory. A few minutes once a week or less often will do no good and wastes drill time of which the guard has none to spare. The detailed sergeants should help in all drill work but especially should be valuable in teaching camp expedients, care of equipment, etc. [Sidenote: Use of schools for N. C. O.] I believe that in nearly every state the officers pursue a theoretical course each winter and generally there is a non-commissioned officers’ school as well. In the latter school there should be thoroughly taught, giving importance and precedence in the order stated: Infantry Drill Regulations, Manual of Guard Duty, Small Arms Firing Regulations, and parts of Field Engineering. Parts of the Field Service Regulations should be read carefully in connection with the study of the same subject in Infantry Drill Regulations. If more time is available map reading should be taught, and, if time remains, then applied minor tactics on the map. Attempt no more than you can _thoroughly_ do in the time available and make the course progressive. [Sidenote: Schools for officers]