One by one the tribe swung down from their arboreal retreats and formed a circle about Tarzan and his vanquished foe. When they had all come Tarzan t… - Edgar Rice Burroughs

The duties of kingship among the anthropoids are not many or arduous. … But Tarzan tired of it, as he found that kingship meant the curtailment of his liberty. He longed for the little cabin and the sun-kissed sea — for the cool interior of the well-built house, and for the never-ending wonders of the many books. As he had grown older, he found that he had grown away from his people. Their interests and his were far removed. They had not kept pace with him, nor could they understand aught of the many strange and wonderful dreams that passed through the active brain of their human king. So limited was their vocabulary that Tarzan could not even talk with them of the many new truths, and the great fields of thought that his reading had opened up before his longing eyes, or make known ambitions which stirred his soul. Among the tribe he no longer had friends as of old. A little child may find companionship in many strange and simple creatures, but to a grown man there must be some semblance of equality in intellect as the basis for agreeable association.

And so he learned to read. From then on his progress was rapid.

Emerging, as we had, from the dark and gloomy bowels of the earth, the scene before us presented a view of wondrous beauty, and, while doubtless enhanced by contrast, it was nevertheless such an aspect as is seldom given to the eyes, of a Barsoomian of today to view. To me it seemed a little garden spot upon a dying world preserved from an ancient era when Barsoom was young and meteorological conditions were such as to favor the growth of vegetation that has since become extinct over practically the entire area of the planet. In this deep valley, surrounded by lofty cliffs, the atmosphere doubtless was considerably denser than upon the surface of the planet above. The sun's days were reflected by the lofty escarpment, which must also hold the heat during the colder periods of night, and, in addition to this, there was ample water for irrigation which nature might easily have achieved through percolation of the waters of the river through and beneath the top soil of the valley.