DR PUNCH COSTELLO: The fetor judaicus is most perceptible.
…rise from his seat so as not to outstay their welcome having first and foremost, being as good as his word that he would foot the bill for the occasion, taken the wise precaution to unobtrusively motion to mine host as a parting shot a scarcely perceptible sign when the others were not looking to the effect that the amount due was forthcoming, making a grand total of fourpence (the amount he deposited unobtrusively in four coppers, literally the last of the Mohicans), he having…
More active air, a matutinal distant cock, ecclesiastical clocks at various points, avine music, the isolated tread of an early wayfarer, the visible diffusion of the light of an invisible luminous body, the first golden limb of the resurgent sun perceptible low on the horizon.
There are no more uses of "perceptible" in the book.
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The car makes a barely perceptible clicking sound at high speeds.