This showed her how vastly different.
But as he talked on she began to feel that it had not become as different to him as to her.

He had not been making little excursions up and down unknown paths.

He had remained right in his place.

That place seemed to him the place for Katie Jones.
As he talked on--about what he called Life--sublimely unconscious of the fences all around him shutting out all view of what was really life--it became unmistakable that Captain Prescott was getting ready to propose to her.

She had had too much experience with the symptoms not to recognize them.
Katie did not want to be proposed to.