Both Uses

perceptible
in
A Good Man is Hard to Find AND OTHER STORIES
(Auto-generated)

There had not been any perceptible change in him for the last five years, but she had the sense that she might be cheated out of her triumph because she so often was.†
Story 8. *

perceptible = capable of being noticed
As Sally Poker, who was near the end, crossed, she glanced at the General and saw him sitting fixed and fierce, his eyes wide open, and she turned her head forward again and held it a perceptible degree higher and received her scroll.†
Story 8.

Definitions:

(1) (perceptible)
capable of being noticed -- typically because it is different enough or large enough
(2) (meaning too rare to warrant focus)