16. fuga. Latin says 'by flight,' not 'in flight.'

17. ex spelunca. See the note on 10, 3.

21. locum, the direct object of Adiit, which is here transitive. We might
also have _ad locum_ with _adeo_ used intransitively.

16. 4. Herculi. See the note on 10, 15.

laborem. This labor is usually given as the sixth, the destruction of the
Stymphalian birds as the fifth.

6. tria milia boum, 'three thousand cattle,' literally 'three thousands
of cattle.' The partitive genitive is the regular construction with the
plural _milia_, but the singular _mille_ is commonly used as an
adjective, like English 'thousand.' Thus 'one thousand cattle' would be
_mille boves_.

7. ingentis magnitudinis. See the note on _tantae audaciae_, 13, 23.

8. neque enim umquam, 'for ... never.' See the note on _neque enim_, 7,
12.

11. multae operae. See the note on _magni periculi_, 13, 8.

12. duodeviginti pedum, i.e. in width.

duxit. This word is used with reference to the progress of work on a wall
or ditch from one end of it to the other.