He proceeded then, while dexterously attending to the complex movements, to open door after door, to show the astonished spectators the rapid transitions the metal underwent, and suddenly, in the midst of his pride, he stopped short, for, like a lightning-flash, came across his mind the remembrance of the fatal papers.

Within the next door he was to open, they lay concealed.

His change of countenance did not escape Richard, and he noted the door which Adam forbore to open, as the student hurriedly, and with some presence of mind, passed to the next, in which the metal was shortly to appear.
"Open this door," said the prince, pointing to the handle.

"No! forbear! There is danger! forbear!" exclaimed the mechanician.
"Danger to thine own neck, varlet and impostor!" exclaimed the duke; and he was about himself to open the door, when suddenly a loud roar, a terrific explosion was heard.

Alas! Adam Warner had not yet discovered for his engine what we now call the safety-valve.