OSMOTIC PRESSURE OF TISSUE FLUIDS 
455 
not merely to the success of our work but to the pleasure of our stay 
in Jamaica. 
Station for Experimental Evolution, 
Cold Spring Harbor, N. Y. 
LITERATURE CITED 
Dixon, H. H. Transpiration and the Ascent of Sap in Plants. Macmillan & Co. 
1914. 
Dixon, H. H. and W. R. G. Atkins. Changes in the Osmotic Pressure of the Sap of 
the Developing leaves of Syringa vulgaris. Sci. Proc. Roy. Dublin Soc. 
n. ser. 13: 219-222. 1912. 
Dixon, H. H. and W. R. G. Atkins. Variation in the Osmotic Pressure of the Sap 
oi Ilex aquifolium. Sci. Proc. Roy. Dublin Soc. n. ser. 13: 229-238. 1912. 
Dixon, H. H. and W. R. G. Atkins. Variations in the Osmotic Pressure of the Sap 
of the Leaves of Hedera Helix. Sci. Proc. Roy. Dublin Soc. n. ser. 13: 239- 
246. 1912. 
Dixon, H. H. and "W. R. G. Atkins. Osmotic Pressures in Plants, IV. On the 
Constituents and Concentration of the Sap in the Conducting Tracts, and on 
the Circulation of Carbohydrates in Plants. Sci. Proc. Roy. Dublin Soc. 
n. ser. 14: 374-392. 1915. 
Dixon, H. H. and W. R. G. Atkins. Seasonal Variations in the Concentration of the 
Cell Sap of Some Deciduous and Evergreen Trees. Sci. Proc, Roy. Dublin 
Soc. n. ser. 14: 445-461. 19 15. 
Gorke, H. tJber chemische Vorgange beim Erfrieren der Pflanzen. Landwirthsch. 
Versuchs. Stat. 65: 149-160. 1906. 
Harris, J. Arthur and R. A. Gortner. Note on the Calculation on 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: 75-78. 1914. 
Harris, J. Arthur, R. A. Gortner and J. V. Lawrence. A Comparison of the Physico- 
Chemical Constants of the Juices Expressed from the wall and from the 
Included Carpellary whorl in Proliferous Fruits of Passiflora gracilis. Bio- 
chem. Bull. 4: 52-79. 1915. 
MacDougal, D. T. An Attempted Analysis of Parasitism. Bot. Gaz. 52: 249-260. 
1911. 
MacDougal, D. T. Induced and Occasional Parasitism. Bull. Torrey Club 38: 
473-480. 191 1. 
MacDougal, D. T. and W. A. Cannon. The Conditions of Parasitism in Plants. 
Publ. Carn. Inst. Washington 129. 1910. 
Shreve, F. A Montane Rain Forest. A Contribution to the Physiological Plant 
Geography of Jamaica. Publ. Carn. Inst. Washington 199. 1914. 
York, H. H. The CTrigin and Development of the Embryo Sac and Embryo of 
Dendrophthora opuntioides and D, gracilis. Bot. Gaz. 56: 89-1 11, 200-216. 
1913. 
