CHAPTER XXX.
FRANK AND THE PROFESSOR.
Frank Merriwell was right in thinking he had not seen the last of the man in black.

On the third day after his first meeting with the mysterious stranger he was astonished, while ascending the stairs, to see that individual come out of Professor Gunn's room.

Frank paused on the flight that led to the "Cock-loft," and watched the man hurriedly descend the stairs.
"Great Scott!" muttered the young cadet.

"That is remarkable.

I wonder what he was up to in the professor's room?
He saw me, but he hustled away in a hurry." For a moment Frank hesitated, and then he resolved to find out, if possible, what could be the meaning of the stranger's visit.