_This Lecture was delivered at the South Kensington Museum, in aid of the
College for Working Men and Women. As the Publishers, perhaps
erroneously, believe that some of the few authors who were not present
may be glad to study the advice here proffered, the Lecture is now
printed. It has been practically re-written, and, like the kiss which
the Lady returned to Rodolphe_, is revu, corrige, et considerablement
augmente.