LXX.

But this won't do, save by and by; and he Who, like Don Juan, takes an active share, Must steer with care through all that glittering sea Of gems and plumes and pearls and silks, to where He deems it is his proper place to be; Dissolving in the waltz to some soft air, Or proudlier prancing with mercurial skill, Where Science marshals forth her own quadrille.