This document discusses liquefied petroleum gas (LPG) and its pioneers. It provides molecular formulas and structures for propane and butane, the main components of LPG. It then discusses Walter Otheman Snelling as the pioneer of LPG, noting he had degrees from Harvard, Yale, and George Washington University and discovered LPG at his residence, leading to further exploration by his descendants Richard Arkwright Snelling and Charles Darwin Snelling.