On the Osmotic Concentration of the Tissue Fluids of Phanerogamic Epiphytes

The determinations here recorded were secured in three periods of field work, the first in Jamaica in 1915, the second and third in southern Florida in 1916 and 1917. In the first period I had the advantage of the co-operation of Mr. John V. Lawrence, who remained on the island for some time longer than I was able to do, and to whom I am indebted for a large part of the work on Jamaican forms. In the third period Mr. Charles W. Crane rendered most efficient service in several phases of the work.