Answer:
The results of the former experiments of the author which showed that the permeability of protoplasm increases in light and decreases in the dark were confirmed by the investigations of several authors and by the results obtained in the present paper. 2. The results of investigators who endeavor to show that the permeability increases in light only for some substances, while it may decrease in light for other substances, and that the permeability of protoplasm of some plants increases in the dark while it is not changed by the change of illumination in other cases, are incorrect since the methods used by these investigators to determine the permeability were inexact or faulty
