Note 19 — Chapter IV · SYSTEMS OF ENGLISH PROSODY—THE FOOT
Reading edition
Except, to speak paradoxically, when it is nothing at all. The pause-foot or half-foot, the "equivalent of silence," is by no means an impossible or unknown thing in English poetry, as, for instance, in Lady Macbeth's line, I. v. 41—
Under | my bat|tlements. | ʌ Come, | you spirits,
where | spĭrīts, | though not actually impossible, would spoil the line in one way, and "come," as a monosyllabic foot, in another.