=3. Method of Instruction.=--(i) Instruction in military vocabulary may be carried out in the following manner. In early lessons the instructor will describe in detail simple prominent features, such as part of a skyline or the line of a bank or hedge, and get each man in the class to describe in similar terms another part of the line. He will then practise them by the same method in describing more difficult and extensive features. In this way men will gradually learn the correct terms to apply to a great variety of natural features of ground. When men have learnt how to describe various features of ground in correct terms, the instructor will proceed to describe small areas of ground, the limits of which he will first clearly define. (ii) He will describe the shape and nature of the ground, as, for instance, whether it is level, undulating or broken, and rocky, sandy, or pasture. He will then describe its various natural and artificial features, the different kinds of trees, fences, undergrowth, etc., on it, and the shape and size of the fields, with the colour of the earth or of crops growing in them. The approximate measurements of objects, roughly estimated, may also be given, as, for instance, whether they are large, small, of moderate size, tall, short, wide, or narrow. These rough measurements will often help to distinguish objects, such as trees, fields, hedges, or houses from one or more objects of a similar nature. Men will first be thoroughly practised in completing the description of ground and its features commenced by the instructor, and then, as progress is made in describing ground which is merely pointed out by the instructor without being partly described by him. Fig. 43 illustrates common features of ground which may be described in the manner outlined in these paragraphs. =4. Study of Ground.=--It is clear that instruction in military vocabulary provides a good opportunity for training fire-unit commanders and men in the study of ground, which is of the greatest military importance. Therefore, in training men in the description of ground, instructors should also train them _to recognize all features of military importance_, such as good defensive positions, good lines of approach, good halting-places for attack, covered approaches, dead ground, obstacles, and good or dangerous cover.[17] When men have learned to recognize features of military importance, the instructor will indicate an area of ground, and question the class in turn as to what military features may be seen on it. Men must describe these military features in the correct terms, and they will thus learn an extremely important branch of military vocabulary--namely, that applied to ground--which must frequently be described to them and recognized by them as aiming points in a later stage of their training. [Illustration: A. _Skyline_ B. _Hollow_ C. _Gentle slope_ D. _Steep slope_ E. _Dense cover_ F. _Crest of Hill_