4. únó pede núdó, 'with one foot bare,' the ablative absolute. This construction consists of two parts, a noun, or pronoun corresponding to the subject of a clause, and a participle corresponding to the verb of a clause. A predicate noun or adjective may take the place of the participle. In the latter case the use of the participle 'being' will show the two parts in the relation of subject and predicate, 'one foot being bare.'
34.6. démónstrávisset, subjunctive because subordinate in indirect discourse. See the note on 33, 10. Pelias thought, Híc est homó quem óráculum démónstrávit.
9. vellus aureum. Phrixus and his sister Helle were about to be put to death, when they were rescued by a ram with fleece of gold, who carried them off through the air. Helle fell from the ram's back into the strait that separates Europe and Asia, called after her the Hellespont, 'Helle's sea,' and known to us as the Dardanelles. Phrixus came safely to Colchis, and here he sacrificed the ram and gave the fleece to Aeetes. Read Mr. D.O.S. Lowell's Jason's Quest.
11. ut … potírétur. See the note on 27, 6.
hóc vellere. Potior takes the same construction as véscor, for which see the note on 16, 19.
16. iter, accusative of extent.
20. úsuí, dative of purpose. We say 'of use' or 'useful.'
24. operí dative after the compound with prae. Notice that not all verbs compounded with prepositions govern the dative. Many compounds of ad, ante, com (for cum), in, inter, ob, post, prae, pró, sub, and super do have the dative, and some compounds of circum. You will find it profitable to keep a list of all such compound verbs governing the dative that you meet in your reading.
25. né … quidem, 'not … even.' The word emphasized must stand between né and quidem.
ad labórem. See the note on ad quiétem, 14, 1.