“…There is then a gap, presumably due to World War I, that extends until a second burst of work from 1928 to 1943 on a variety of catch-producing molluscan muscles (von Uexküll, 1926;Bozler, 1928Bozler, , 1930Bozler, , 1931aBozler, , 1936Bayliss et al, 1930;Jordan, 1931;van Overbeek, 1931;Herter, 1931a,b;Fletcher, 1937;Winton, 1937;van Dijk, 1937;Pumphrey, 1938;Singh, 1938aSingh, ,b, 1943. These papers showed that these muscles could produce both rapidly and slowly relaxing contractions, depending on the details (alternating or direct current, respectively) of the electrical stimulation used.…”