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 those that were not already dead and proceeded to skin the carcasses. As he worked, rapidly and with great skill, he neither hummed nor whistled as does the average man of civilization. It was in numerous little ways such as these that he differed from other men, due, probably, to his early jungle training. The beasts of the jungle that he had been reared among were playful to maturity and seldom thereafter. His fellow-apes, especially the bulls, became fierce and surly as they grew older. Life was a serious matter during lean seasons—one had to fight to secure one's share of food then and the habit once formed became lifelong. Hunting for food was the life labor of the jungle bred, and a life labor is a thing not to be approached with levity nor prosecuted lightly. So all work found Tarzan serious, though he still retained what the other beasts lost as they grew older—a sense of humor, which he gave play to when the mood suited him. It was a grim humor and sometimes ghastly; but it satisfied Tarzan.

Then, too, were one to sing and whistle while working on the ground, concentration would be impossible. Tarzan possessed the ability to concentrate each of his five senses upon its particular business. Now he worked at skinning the six pigs and his eyes and his fingers worked as though there was naught else in all the world than these six carcasses; but his ears and his nose were as busily engaged elsewhere—the former ranging the forest all about and the latter assaying each passing zephyr. It was