Studies on the Protease of Fishes (IX) : On the Proteolytic and Chemical Properties of the Enzymes in Pyloric Appendage of Long Fin Tuna Thunnus alalunga (IV) : Precipitation of Protease-compound in Enzyme Solution Extracted from Powder of Pyloric Appendage of Long Fin Tuna by Adding Ammonium-sulfate of Various Concentration and Proteolytic Activity of that Precipitate