The moment that you had pronounced him one,

Presto! his face changed, and he was another;

And when that change was hardly well put on,

It varied, till I don't think his own mother

(If that he had a mother) would her son

Have known, he shifted so from one to t'other;

Till guessing from a pleasure grew a task,[hl]

At this epistolary "Iron Mask."[540]