Léon Fredericq

He received an MD in 1875 and went to France studying under Louis-Antoine Ranvier, Georges Pouchet, Wilhelm Waldeyer, Ernst Tiegel, Felix Hoppe-Seyler and others.

He also spent some time studying the nerve physiology of sea urchins at Roscoff under Henri de Lacaze-Duthiers.

[1] In 1879 he studied nerve impulse transmission in lobsters and in the same year he succeeded Theodor Schwann as professor of physiology at the University of Liège.

Fredericq conducted a number of studies, some tangential to his main field, driven by accidental discoveries.

He tasted the blood of marine invertebrates and found them to be salty while bony fishes seemed to maintain a lower salt level which made him examine osmoregulation from 1901.