One of the chief difficulties in following this method of drawing from nature is to hold our measuring-stick exactly vertical or horizontal. This difficulty can be overcome by providing yourself with a T-square (Fig. 147) and attaching to it, at the point P, a string with a weight tied on the other end so that it will hang plumb. By using this we can be sure whether we hold it straight or not, for in case we tip it too much on one side or the other the string will swerve from the middle of the upright stick. Of course, whenever we hold the T-square perfectly straight, the string will fall straight down the middle of the upright, and the top of the T will then give us a true horizontal line. A little thought and practice will lead you to thoroughly understand this method, and when you really understand it you will have an unerring guide to assist you. Of course, as the eye and hand become more trained, with practice and observation, the work will become easier, and you will not need the T-square. In beginning the practice of drawing from nature, we had better confine our first efforts to things that will stand still, for without a practised hand it will be almost impossible to sketch a restless subject; but if we attempt to do so, we should follow the methods before taught as nearly as possible. Now, suppose we step out of doors in search of something to sketch. The first moving object our eyes rest upon is a goose, and we decide to use him as a model. But he is so restless, will not keep still an instant. First we have a front view, then a side view, and again he turns his back upon us. If we really must have his picture, the only way is to catch him and tie him up. Yet even now he is a difficult subject, twisting and turning, and bobbing his head about. Determined on sketching him, however, we observe the position in which he remains the longest time, or assumes oftenest, and begin our work. We first note the general proportions. Is his body as thick as it is long? Is his neck as long as his body? Are his legs nearest the head or tail? Is the head as long as the neck? What part reaches the highest, or what part the lowest? We hastily but carefully consider these questions and determine in our own mind the answers, for we must get an idea of the proportions before we begin our sketch. Now we draw a horizontal line along our paper, and then hold up our pencil horizontally, so that it will answer for a straight line drawn across the body of the real goose (Fig. 148). This will represent the horizontal line on the paper. Noticing then the directions the outlines of the goose take from the horizontal line (represented by the pencil), we sketch them in on the paper, remembering that one of the most important things is to get the right directions of the lines. [Illustration: _Fig. 148_] Observe that in Fig. 149 the line G is directed to too high a point, and makes the body too thick and out of proportion. [Illustration: _Fig. 149_]