298 J. ARTHUR HARRIS AND JOHN V. LAWRENCE 
which are made possible by the data presented eariier in these pages, 
and in the original papers to which reference has been made. 
Further comparisons will be made when the data from other field 
work are properly arranged for discussion. 
Carnegie Institution of Washington 
V. Literature Cited 
Dixon, H. H. and W. R. G. Atkins. Osmotic Pressures in Plants. I. Methods of 
Extracting Sap from Plant Organs. Sci. Proc. Roy. Dublin Soc. N. Ser. 13: 
422. 1913. Also in notes from Bot. School Trin. Coll. Dublin, 2: 154. 1914. 
Gortner, R. A. and J. Arthur Harris. Notes on the Technique of the Determinations 
of the Depression of the Freezing Point. Plant World 17: 49. 1914. 
Gortner, R. A., John V. Lawrence and J. Arthur Harris. The Extraction of Sap 
from Plant Tissues by Pressure. Biochem. Bull. 5: 139. pi. i. 1916. 
Harris, J. Arthur and R. A. Gortner. Note on the Calculation of the Osmotic 
Pressure of Expressed Vegetable Saps from the Depression of the Freezing 
Point, with a Table for the Values of P for A = .001° to A = 2.999°. Amer. 
Journ. Bot. i: 75. 1914. 
Harris, J. Arthur and John V. Lawrence. On the Osmotic Pressure of the Tissue 
Fluids of Jamaican Loranthaceae Parasitic on Various Hosts. Amer, Journ. 
Bot. 3:438. Diag. 1-2. 1916. 
Harris, J. Arthur and John V. Lawrence. Cryoscopic Determinations on the Tissue 
Fluids of the Plants of the Jamaican Coastal Deserts. Bot. Gaz. In press. 
Harris, J. Arthur and John V. Lawrence. 191 76. The Osmotic Concentration of 
the Sap of the Leaves of Mangrove Trees. Biol, Bull. 32: 202. 1917. 
Harris, J. Arthur, John V. Lawrence and R. A. Gortner. On the Osmotic Pressure 
of the Juices of Desert Plants. Science, N, ser, 41: 656, 1915. 
Harris, J. Arthur and John V. Lawrence. With the co-operation of R. A. Gortner. 
The Cryoscopic Constants of Expressed Vegetable Saps as Related to Local 
Conditions in the Arizona Deserts. Physiol, Res, 2: i. 1916. 
Johnson, D. S. The Cinchona Botanical Station. Pop. Sci. Monthly 85: 521. 
1914; 86: 33. 1915. 
Ohlweiler, W. W. The Relation between the Density of Cell Saps and the Freezing 
Point of Leaves, Ann, Rept. Mo. Bot. Card. 23: loi. 1912. 
Shreve, F. A Montane Rain Forest: A Contribution to the Physiological Plant 
Geography of Jamaica, Pub, Carn, Inst. Washington 199. 1914. 
