The manner of casting a fly is best described by an explanation of the overhead cast—the typical cast although by no means the one exclusively used in fly fishing, and in dry fly fishing, for reasons stated below, a cast which is used only when the horizontal cast is for any reason rendered difficult. Having assembled rod, reel, line, leader, and fly, using the knots shown in Chapter III., and taking pains to see that the leader before bending on the fly and attaching to the line has been previously well-softened by soaking in the leader-box, proceed to make the overhead cast as follows.
In the case of the beginner at fly-casting, the first practice casting may best be done casting downstream as the current will help to straighten out the line and leader. Two distinct motions constitute the complete overhead cast; first the back cast which throws the line behind the caster, then the forward cast which returns it in the desired direction. Fifteen or twenty feet is enough line to use for the first practice casting. The right hand should grip the rod firmly with the thumb extended along the upper surface of the handgrasp—this is the only proper grip of the rod and is a distinct factor for accuracy in placing the fly and also tends to make the caster use his wrist.
Good casting results only from utilizing the elasticity of the rod; the casting power of the rod is brought into play in one way only—by using the wrist in casting. Keep the elbow low.
In the back cast swing the rod smartly up to a position but slightly beyond the vertical and inclined a little toward the right so that the line when passing to the rear, or returning, will not tend to strike the rod. In the back cast throw the line up in order that there may be no possibility of its falling upon the water behind you—a high back cast is very essential. Lift the line from the water quickly and neatly. Care must be taken not to carry the rod too far back—only a little beyond the perpendicular—as this will inevitably result in loss of control over the line.
Instantaneous photography has conclusively proved the fallacy of the orthodox advice of the older school of angling writers, to "wait for the line to straighten out behind you" before starting the forward cast. This fact was noted sometime ago in a short paper in one of the outdoor periodicals and the writer at once proceeded to verify it—since which time I have often seen in print the old, familiar warning to the novice stated above. However, it is now generally recognized by well-informed anglers that when casting any fair length of line there is a considerable loop of line and leader which straightens out only after the forward cast has been started; that, in fact, the right time to begin the forward motion of the rod is when the line first begins to pull noticeably on the tip of the rod—a psychological moment soon readily recognized after a little practice. To avoid weakening the leader by whipping, or in rare instances snapping off the fly, the forward cast should not be started too forcefully.
Start the forward motion of the rod, then, when the line, having passed to the rear, begins to pull back on the rod-tip, and carry the rod forward and down with increasing speed, stopping it when it is a little beyond parallel with the water. Before beginning another back cast be careful to reel or strip in any slack line. The beginner should concentrate on casting accurately and delicately; ability to cover average fishing distances is soon gained without much conscious effort to that end. As for accuracy, the dry fly man cannot possibly over-rate its importance or more profitably seek to perfect himself in any other branch of the sport. Particularly when casting to a rising fish, other things being equal, everything depends upon accuracy.
At this point it seems best to note the matter of the use of the left hand in fly-casting for the purpose of controlling the rendition and retrieve of the line while casting, playing a trout, or floating a dry fly. In brief, the caster should control the line, practically at all times, by holding it in his left hand, as it comes from the reel, stripping in the line through the guides of the rod when it should be shortened, or allowing it to run out through the fingers when a longer line is needed in casting or when giving line to a hooked fish.
It should be understood that the left hand, when used in this manner, need not be held in an awkward position, that is, close up to the reel, but may be held in a natural way at about the waist-line; it is simply a matter of the length of the loop of line drawn out by the left hand between the reel and the first guide of the rod. When this loop for any reason becomes so long that there may be a possibility of fouling it may be taken care of by shifting the rod to the left hand, clipping the line to the handgrasp of the rod beneath the fingers of the left hand, and winding up the superfluous slack line.
The beginner should accustom himself to handling the line in this way when first learning the use of the fly-rod; later it will be all the more difficult to master since at the same time he will be under the necessity of correcting other casting habits which may have become almost second nature. Further reference to this manner of manipulating the line—a most important factor in effective fly casting and fishing—will be found in connection with various subjects such as playing and landing a trout, methods of preventing drag, and so on; in fact, in one way or another the method is essentially a part of practically every phase of the purely manual side of dry or wet fly fishing.