Two lovely twins, the effect of this embrace, Crown their soft labours, and their nuptials grace, Who, like their mother, beautiful and fair, Their father’s strength, and feather’d pinions, share: Yet these at first were wanting, as ’tis said, And after, as they grew, their shoulders spread. Zethes and Calais, the pretty twins, Remain’d unfledg’d, while smooth their beardless chins: But when, in time, the budding silver down Shaded their face, and on their cheeks was grown, Two sprouting wings upon their shoulders sprung, Like those in birds, that veil the callow young. Then, as their age advanced, and they began From greener youth to ripen into man, With Jason’s Argonauts they cross’d the seas, Embark’d in quest of the fam’d golden fleece; There, with the rest, the first frail vessel tried, And boldly ventured on the swelling tide.