Beside them was the dark well-hole, with that horrid effluvium
stealing up from its mysterious depths.
He could differentiate the innumerable species of the herbivora by scent, and he could tell, too, whether an animal was approaching or departing merely by the waxing or waning strength of its effluvium
Frequently, when passing at the distance of half a mile to leeward of a herd, I have perceived the whole air tainted with the effluvium
In places it was totally obliterated by the passage of many beasts, and where the way was rocky, even Tarzan of the Apes was almost baffled; but there was still the faint effluvium
which clung to the human spoor, appreciable only to such highly trained perceptive powers as were Tarzan's.