Discovery of photosynthesis

In 1727, the English botanist Stephen Hales published a book, Vegetable Statick s, in which he observed that the plants use mainly air as the nutrient during their growth. In 1774 Joseph Priestly discovered oxygen and experimented with this new, invisible gas. He found that plants could restore air which has been injured by the burning of candles. A few years later, in 1977, Jan Ingenhousz, Dutch physician to the Austrian empress read about Priestley’s experiment and was fascinated. He rented a