"'But, madam,' said I, 'I have not yet done what I came for. I
cannot possibly leave until I have seen the machine.'

"'It is not worth your while to wait,' she went on. 'You can pass
through the door; no one hinders.' And then, seeing that I smiled
and shook my head, she suddenly threw aside her constraint and
made a step forward, with her hands wrung together. 'For the love
of Heaven!' she whispered, 'get away from here before it is too
late!'

"But I am somewhat headstrong by nature, and the more ready to
engage in an affair when there is some obstacle in the way. I
thought of my fifty-guinea fee, of my wearisome journey, and of
the unpleasant night which seemed to be before me. Was it all to
go for nothing? Why should I slink away without having carried
out my commission, and without the payment which was my due? This
woman might, for all I knew, be a monomaniac. With a stout
bearing, therefore, though her manner had shaken me more than I
cared to confess, I still shook my head and declared my intention
of remaining where I was. She was about to renew her entreaties
when a door slammed overhead, and the sound of several footsteps
was heard upon the stairs. She listened for an instant, threw up
her hands with a despairing gesture, and vanished as suddenly and
as noiselessly as she had come.

"The newcomers were Colonel Lysander Stark and a short thick man
with a chinchilla beard growing out of the creases of his double
chin, who was introduced to me as Mr. Ferguson.