| Summary: | In 1811, Nicolas Vauquelin reported the presence of potassium in brain (408). Ana1yzing the ash residues of muscle, Liebig found more potassium than sodium (cited by Kaunitz,211). He suggested that potassium occupies an intracellular position and sodium, an extracellular position, in muscle tissues (see Tower,392). Since that timea long series of analytical studies have shown that an analogous distribution of the two elements exist almost universa1ly in bacterial, plant and animal cells (see Reinberg,J27). Fenn has defined this phenomenon, writing: "As is well known, potassium is of the soi1 and not the sea; it is of the cell but not the sap" (122). [...]
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