“…In order to examine the effects of ions in various concentrations, 1 M solutions of NaCl, RbCI, Na4Fe(CN)6 or Na2SO4 were diluted by distilled water and 2-1, 2-2, 2-3 ... 2-12 and 2-13 M solutions were prepared. When the effects of the osmotic pressure of the stimulating solutions were examined, isotonic (6 %) sucrose solution which had been found to have no stimulating action by itself (TAKAGI et al, 1978), was used and various hypertonic and hypotonic sucrose solutions were prepared.…”