And now came twenty years in science that made Faraday the wonder and ornament of his age. Elected an F.R.S., he began at once twelve lectures in Chemical Manipulation before the London Institution, six on Chemical Philosophy before the Royal Society, published six papers on electromagnetism, and began a course of juvenile lectures which continued for nineteen years. This was one of the beautiful things of Faraday's life,--a great man living in a whirl of work, yet taking time to make science plain to the young. When asked at what age he would teach science, he replied that he had never found a child too young to understand him. For twenty years he lectured at the Royal Academy at Woolwich, became scientific adviser to the government with regard to lighthouses and buoys, not for gain, but for the public good, drew all London to his eloquent lectures with his brilliant experiments, Prince Albert attending with his sons; and published one hundred and fifty-eight scientific essays and thirty series of "Experimental Researches in Electricity," which latter, says Dr. Gladstone, "form one of the most marvellous monuments of intellectual work; one of the rarest treasure-houses of newly-discovered knowledge, with which the world has ever been enriched." He not only gathered into his vast brain what other men had learned of science, but he tested every step to prove the facts, and became, says Professor Tyndall, "the greatest experimental philosopher the world has ever seen." He loved science as he loved his family and his God, and played with Nature as with a petted child. When he lectured, "there was a gleaming in his eyes which no painter could copy, and which no poet could describe. His audience took fire with him, and every face was flushed." In his earlier discoveries in compressing gases into liquids, he obtained from one thousand cubic feet of coal gas one gallon of fluid from which he distilled benzine. In 1845 the chemist Hofman found this same substance in coal-tar, from which come our beautiful aniline dyes. After eighteen years of studying the wonderful results of Galvani's discovery at the University of Bologna, that the legs of a dead frog contract under the electric current; and of Volta, in 1799, with his voltaic pile of copper, zinc, and leather, in salt-water; and of Christian Oersted at the University of Copenhagen; and Ampere and Arago, that electricity will produce magnets, Faraday made the great discovery of magneto-electricity,--that magnets will produce electricity. At once magneto-electric machines were made for generating electricity for the electric light, electro-plating, etc. This discovery, says Professor Tyndall, "is the greatest experimental result ever attained by an investigator, the Mont Blanc of Faraday's achievements."