He may have gone to the library or to the observatory, or for a walk.

Won't you please come in ?" Her gravity amused the young man, who did not think it so serious a matter to gain an interview with a retired professor in a small college.
They debated, with much formality on both sides, whether Sylvia should seek her grandfather or merely direct the visitor to places where he would be likely to find him; but as the stranger had never seen Professor Kelton, they concluded that it would be wiser for Sylvia to do the seeking.
She ushered the visitor into the library, where it was cooler than on the doorstep, and turned toward the campus.

It is to be noted that Sylvia moves with the buoyant ease of youth.

She crosses the Lane and is on her own ground now as she follows the familiar walks that link the college buildings together.

The students who pass her grin cheerfully and tug at their caps; several, from a distance, wave a hand at her.