Imperceptibly my candles became the only incongruous part of the morning, the dark places in my room all melted away, and the day shone bright upon a cheerful landscape, prominent in which the old Abbey Church, with its massive tower, threw a softer train of shadow on the view than seemed compatible with its rugged character.
First, that he seems imperceptibly to establish a dreadful right of property in mademoiselle.
There are no more uses of "imperceptible" in the book.
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...and he let the line slip down, down, down, unrolling off the first of the two reserve coils. As it went down, slipping lightly through the old man’s fingers, he still could feel the great weight, though the pressure of his thumb and finger were almost imperceptible.