His Lehrbuch der Botanik was the plant physiology bible of its time .
Stephen Hales is considered the Father of Plant Physiology for the many experiments in the 1727 book ; though Julius von Sachs unified the pieces of plant physiology and put them together as a discipline .
Stephen Hales ' Lehrbuch der Botanik was the plant physiology bible of its time .
Stephen Hales is considered the Father of Plant Physiology for the many experiments in the 1727 book ; though Julius von Sachs unified the pieces of plant physiology and put them together as a discipline .