﻿BOTANICAL GAZETTE 



3. There is no indication that either high osmotic pressure or 

 low surface tension is an important factor in the toxicity of bog 

 water or of very dilute solutions resulting from the decay of 

 Nymphaea rhizomes. 



The writers wish to express thanks to Dr. F. A. Osborn for 

 advice on the surface tension determinations. 



LITERATURE CITED 



Phytol. 11:180-195. 1912. 

 2. Czapek, F., Chemical phenomena in life. New York. 1911. 

 3- • Uber eine Methode zur direkten Bestimmung der Oberflachen- 



spaunung der Plasmahaut von Pflanzenzellen. Jena. 1911. 



4. Fitting, H., Die Wassersorgane und die osmotischen Druckverhaltnisse 

 der Wustenpflanzen. Zeitsch. Bot. 3:209-275. 1911. 



5. Livingston, B. E., Physical properties of bog water. Bot. Gaz. 37 .-383- 

 385. 1904. 



6. Morse, Holland, and Myers, Amer. Chem. Jour. 45:561. 1911. 



7. Rigg, G. B., The effect of some Puget Sound bog waters on the root hairs 

 of Tradescantia. Bot. Gaz. 55:314-326. 1913. 



8. , Notes on the flora of some Alaskan sphagnum bogs. Plant World 



9. , Decay and soil toxins. Bot. Gaz. 61:295-310. 1916. 



10. Sherff, E. E., The vegetation of Skokie marsh with special reference to 

 subterranean organs and their interrelationships. Bot. Gaz. 53:4i5 - 435- 



)f the osmotic pressure of pool, pond, 



