Abstract
It was found that cylindrical filter paper dyed by the dye-stuff (Indanthrene's dye-stuff: Indanthrene Black, B. B., Indanthrene Brilliant G. B., and Anthra Yellow G C N.) gives very good results for the evaporating surface of the atmometer and that the ratio of the length of filter paper to the amount of evaporation is constant for three atmometers used in the experiment, the lengths being 15cm, 9cm and 7cm. Thus we see that the newly designed atmometer is more convenient than any other atmometers used in ecological research.
