Categories:Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica,
Articles with short description,
Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference,
A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
A scientific hypothesis that survives experimental testing becomes a scientific theory
He proposed a fresh theory of alkalis that later was accepted in chemical practices