Papers in the Biological Sciences


Date of this Version



Published in The Ohio Journal of Science [Vol. XVI, No. 3, Jan., 1916], pp. 91-100.


Yapp in trying to account for the xerophytic structure of marsh plants by means of evaporation studies has shown a definite correlation to exist between the strata of marsh vegetation and rates of evaporation at corresponding levels. The following studies were made in an attempt to discover what additional correlations, if any, exist between distribution of marsh plants and the evaporational power of the air at different portions of the habitat. While the exact quantitative significance of such work as the following may be brought into question, as it often is, the striking results obtained by Transeau, Livingston, Fuller, Weaver, Yapp, and others, show that when such work is carefully done it is of unusual efficiency, considering its extra-laboratory character.