plant physiology

Stephen Hales and the Blood Pressure

Stephen Hales and the Blood Pressure

On September 17, 1677, English clergyman Stephen Hales was born. Hales made major contributions to a range of scientific fields including botany, pneumatic chemistry and physiology. He was the first person to measure blood pressure. He also invented several devices, including a ventilator, a pneumatic trough and a surgical forceps for the removal of bladder stones. In addition to these achievements was a philanthropist and wrote a popular tract on alcoholic intemperance. “We are…
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Wilhelm Pfeffer – a Pioneer of Plant Physiology

Wilhelm Pfeffer – a Pioneer of Plant Physiology

On March 9, 1845, German botanist and plant physiologist Wilhelm Pfeffer was born. Pfeffer’s work on osmotic pressure made him a pioneer in the study of plant physiology. With Julius von Sachs, he was a leader in systematizing the fundamentals of plant physiology. Youth and Education Wilhelm Pfeffer was the son of a pharmacist. At first he attended the Kurfürstliche Gymnasium in Kassel, then became an apprentice pharmacist and passed the assistant examination…
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