These suffumigations ended, Dee seated himself on a chair near the table, whither he was followed by Kelley, and commanding Fawkes not to move a footstep, as he valued his safety, he waved his wand, and began in a solemn tone to utter an invocation.

As he continued, a hollow noise was heard overhead, which gradually increased in loudness, until it appeared as if the walls were tumbling about their ears.
"The spirits are at hand!" cried Dee.

"Do not look behind you, or they will tear you in pieces." As he spoke, a horrible din was heard, as of mingled howling, shrieking, and laughter.

It was succeeded by a low faint strain of music, which gradually died away, and then all was silent.
"All is prepared," cried Dee.

"Now, what would you behold ?" "The progress of the great enterprise," replied Fawkes.
Doctor Dee waved his wand.