The Crow and the Pitcher of Water
A crow was almost dying of thirst when he spied a pitcher, but he found that it was nearly empty. The little water in it was so low, that try as he might, he was unable to reach it. He then tried to break the pitcher, then to overturn it, but his strength was not sufficient to do either. At last, seeing a number of small pebbles close by, he dropped them in one by one, until the water rose to the brim and he was able to quench his thirst. Often, necessity is the mother of invention. (Encyclopedia of Illustrations #2066).