? ? ? ? Again, a minute bit of bark has been upturned by the scraping hand, and the direction of the break indicates the direction of the passage. Or some great limb, or the stem of the tree itself has been brushed by the hairy body, and a tiny shred of hair tells him by the direction from which it is wedged beneath the bark that he is on the right trail.
? ? ? ? Nor does he need to check his speed to catch these seemingly faint records of the fleeing beast.
? ? ? ? To Tarzan they stand out boldly against all the myriad other scars and bruises and signs upon the leafy way. But strongest of all is the scent, for Tarzan is pursuing up the wind, and his trained nostrils are as sensitive as a hound's.
? ? ? ? There are those who believe that the lower orders are specially endowed by nature with better olfactory nerves than man, but it is merely a matter of development.
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