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82 THE THEEE SPECIES OF TOUCH-FORMATION.
Bent finger, ad Species, compulsory, for rapid forte passages.
1): We moreover now discern, that the Clinging (or flat) finger, requires some measure of Upper-arm release. This incapacitates this form of touch for rapid passages, when these are required forte.
For rapid forte passages, we must therefore use the self-supported arm (Second Species) with the thrusting (or bent) finger in combination with it.1
m): The secret of Agility, hence, is found to lie in the self-supported arm; and combined with it, the thrusting finger, when the passage is forte. Accuracy in ceasing the action at sound, is a law that meanwhile bears no breaking.
The contrasts in Duration, how available :
n): All three Species of touch-formation are Staccato, provided we insist meanwhile on the Act of Resting being sufficiently light;—so light that the arm is continuously in a state of complete self-support; and provided we are also careful to time our actions against the keys to cease so accurately as to permit these to rebound.2
o) : All the Species can be transformed into Tenuti, by merely changing the Resting into a slightly heavier form, the arm (as to its continuous condition) being here not quite so fully supported as in Staccato.
p) : All the Species can moreover be transformed into Legati, by transferring such Tenuto-form of the Resting from key to key.
The danger of forgetting to think of Sound, when learning new muscular
q): In endeavouring to acquire correct Muscular-conditions, we must meanwhile never lose sight of their Object, viz.: to move the Key for the sake of Music.
1 The clinging-finger, would in rapid forte passages, tend to dull the passage by dragging the Upper-arm on to the key-beds.
1 We must recall that the Continuous condition of the arm, here implied in the Resting, does by no means preclude our using the momentary lapses required in Species III., to form the Added-impetus.