The author describes the kife and scientific work of the hungaryan pharmacist, Józaef Dorner (1808-1873). Dorner worked for 16 years a general pharmacist. But then turned to a special discipline of his profession and became an excellent botanist. He performed at first florristic research, but later concentrated his attention to plant anatomy and physiology, by systematic application of the microscope, be inaugurated a in new aspect in botanica. Very soon, already in 1853, was Dorner discussing bioenergetics. He was selected to Corresponding Member of the Hungarian Academy of Sciences and was a distinguished botanical expert of the Roval Association of Natural Sciences. He has had been estimated as an excellent teacher as well.