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Jan Baptist Van Helmont
Grew a willow tree in a weighed amount of soil. After five years, he discovered that the willow tree weighed about 74 kg more than it did at the start. -
Joseph Priestly
The first evidence that gases participate in photosynthesis was reported by Joseph Priestley in 1772. However he discovered that if a plant is placed in an atmosphere without oxygen, it soon replenishes the oxygen, and a mouse can survive in the resulting mixture. -
Jan Ingenhousz
Discovered photosynthesis by showing that light is essential to the process by which green plants absorb carbon dioxide and release oxygen