I.ii.27 (8,4) [virtue of compassion] Virtue; the most efficacious
part, the energetic quality; in a like sense we say, _The virtue
of a plant is in the extract_.

I.ii.29 (8,5)

[I have with such provision in mine art
So safely order'd, that there is no soul--
No, not so much perdition as an hair,
Betid to any creature in the vessel]

Thus the old editions read, but this is apparently defective.
Mr. Rowe, and after him Dr. Warburton, read _that there is no
soul lost_, without any notice of the variation. Mr. Theobald
substitutes _no foil_, and Mr. Pope follows him. To come so near
the right, and yet to miss it, is unlucky: the author probably
wrote _no soil_, no stain, no spot: for so Ariel tells,

_Not a hair perish'd;
On their sustaining garments not a blemish,
But fresher than before._

And Gonzalo, _The rarity of it is, that our garments being
drench'd in the sea, keep notwithstanding their freshness and
glosses_. Of this emendation I find that the author of notes
on _The Tempest_ had a glimpse, but could not keep it.

I.ii.58 (10,7) [and thy father Was duke of Milan, thou his only
heir] Perhaps--_and_ thou _his only heir_.