7 vast > vaste 1590; wast 1596
1 By this the dreadful beast drew nigh to hand,
By this > At this; by this time
2 Half flying and half footing in his haste, 3 That with his largeness measured much land, 4 And made wide shadow under his huge waist;
waist > girth (cf. SC, "April", 134); or: waste: abundance (this usage not recorded, in OED, until 1725)
5 As mountain does the valley overcast. 6 Approaching nigh, he reared high afore
reared high afore > (If, as seems likely, "reared" is transitive, the dragon reared his body high afore ( = before, in front). But if "reared" is intransitive, a comma is wanted after "afore": "he reared high afore, His body monstrous" etc.)
7 His body monstrous, horrible, and vast, 8 Which, to increase his wondrous greatness more, 9 Was swollen with wrath and poison, and with bloody gore.
111.9
And ouer, all with brasen scales was armd,
2 Like plated coate of steele, so couched neare,
That nought mote perce, ne might his corse be harmd
4 With dint of sword, nor push of pointed speare;
Which as an Eagle, seeing pray appeare,
6 His aery plumes doth rouze, full rudely dight,
So shaked he, that horrour was to heare,
8 For as the clashing of an Armour bright,
Such noyse his rouzed scales did send vnto the knight.