The boats, and trains, and cows and horses were quite meaningless to him, but not quite so baffling as the odd little figures which appeared beneath and between the colored pictures — some strange kind of bug he thought they might be, for many of them had legs though nowhere could he find one with eyes and a mouth. It was his first introduction to the letters of the alphabet, and he was over ten years old.

Ch. 6 : Jungle Battles - Tarzan of the Apes (1912)