On the assumption that the dec reasing velocity of the consumed sulfite during the digestion follows to the 1st. order reaction law, the velocity constants are calculated and by the comparison between the heart wood and the sap wood, the consideration on the difficulty of the digestion with he art wood in Karamatsu and the effects of the seasoning as sawdust is stated. Next supposing that the velocity of the change of the acidity in the sulfite liquor follows also to the 41st. order reaction law, the same consideration as previously reported is related by the comparison between the velocity changes of the sulfites and the acidity in the sulfite liquor during the digestion with the heart wood and the sap wood in Karamatsu.
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