[Hermann von Helmholtz--a physicist in medicine].

Helmholtz left an indelible mark in science. He was a predecessor to the multidisciplinary scientific approach, and his contribution to physics (The Law on Energy Sustainability, Helmholtz's Free Energy, Gibs-Helmholtz's Equationes, Helmholtz Theory of Rotational Liquids Flow, Helmholtz's Oscillatory Cycle, Helmholtz's Waves Equation) and to medicine (Ophthalmoscope, Young-Helmholtz's Theory of Colours, Sight Theory, Speed of Impulse Transfer, Speech and Tone of Voice, The Sound Transfer to Nerves) was indispensable. Helmholtz was surrounded by the respect and love of his contemporaries, appreciated and respected by his followers for the results he left. As a respectable professor of anatomy, physiology and physics at the most eminent universities, "he used to give lectures in such a clear and concise way that they could have been, without any changes, published in a form of a textbook" (Ostwald).