Abstract
Hitherto, the pH values of plants were used to be represented by the one of the pressed sap of them. In the present paper, it is discussed what does the pH values of the pressed sap show. We, thus, found that the pH values of the pressed sap, the tissue fluid and the cell sap (vacuole) from the same part of plant body were different. Accordingly, the pH values of the pressed sap do not usually signify the one of the cell sap. We, therefore, must directly inquire into the pH values of the cell, if we wish to obtain the pH value of the particular part of the plant body.
