=257. His Happy, Useful, and Prosperous Career in Philadelphia.=--For twenty years Franklin lived a prosperous life as an active business man of the good Quaker city. He had become noted for his integrity, sagacity, and prosperity. His newspaper became known for its sparkling and timely editorials. The most intelligent and influential men of the city met in his office to discuss the questions of the day. The same year that Washington was born (1732) Franklin issued the first number of his _Poor Richard's Almanac_, which soon gained great fame for its wise and pithy sayings. The popularity which this little work maintained for twenty-five years was astonishing. Its shrewd and quaint maxims soon became household words in almost every shop and home of the land. Even with his increasing prosperity Franklin found time every day to devote many hours to his books. He became proficient in French, Spanish, Italian, and even Latin. He gave much time to music, and played with skill upon the harp, the guitar, and the violin. This remarkable man now began to be at the head of many kinds of public and private enterprises, from treating with the Indians to plans for cleaning the streets. Honors, both public and private, were heaped upon him. He started a public library in Philadelphia, the first of its kind in America. He invented the famous "Franklin fireplace," which proved very popular and is even in use to-day. The most trivial events would often suggest to him something that would secure beneficial results. The story is told that Franklin saw one day in a ditch the fragments of a basket of yellow willow, in which some foreign goods had been brought into the country. One of the twigs had sprouted. He planted it; and it is said that it became the parent of all the yellow willows in our country. =258. Franklin's Famous Kite Experiment.=--Franklin was a great student of the sciences, especially electricity. He wrote a pamphlet to prove that lightning and electricity are the same thing. The idea was sneered at, and people asked, "Of what use is it?" To which the genial philosopher replied, "What is the use of a child? It may become a man!" He hit on a plan to prove his theory. [Illustration: FRANKLIN'S FAMOUS KITE EXPERIMENT.] This was the famous kite experiment which he tried in 1752. He made a kite of silk, fastened a piece of wire to the stick, and went out with his son to fly it during a thunderstorm. At the lower end of the hempen string was fastened a key, and below that a cord of silk, which is a non-conductor. He held the silk cord in his hand, and when a low thunder cloud passed, he saw that the fibres of the string rose, separated, and stood on end, exactly as the hair does on one's head when one is charged with electricity as he stands on an insulating stool. When Franklin brought his knuckles near the key that he had tied to the string, sparks came from the metal, and he felt slight shocks.