176 Literature Cited. 



Palladin, W. Eiweissgehalt der griinen und der etiolirter Blatter. Ber. d. deut. Bot. 



Ges., 9: 191. 1891. 

 . Transpiration als Ursache der Formanderung etiolirter Pflanzen, Ber, d. 



deut. Bot. Ges., 8: 364. 1890. 

 Pearson, H. H. W. Observations on the internal temperatures of Euphorbia viroaa and 



Aloe dichotoma. Annals Bolus Herbarium, vol. i, part 2. Nov. 1914. 

 RiGG, G. B. Summary of bog theories. The Plant World, 19: 310. 1916. 

 Robertson, T. B ^he physical chemistry of proteins. 1918. 

 ScHiMPER, A. F. W. Die Indo-Malayscher Strandfiora, page 142. 1891. 

 Shreve, E. B. An analysis of the causes of variations in the transpiring power of cacti. 



Physiol. Researches, 2: No. 13. Aug. 1916. 

 . A thermo-electrical method for the determination of leaf temperature. Plant 



World, 22:100. 1919. P. 118. 

 Spoehr, H. A. The pentose sugars in plant metabolism. The Plant World, 21: 365-379. 



1917. 



. Carbohydrate economy of the cacti. Carnegielnst. Wash. Pub. No. 287. 1919. 



Stewart, E. G. Mucilage or slime formation in the cacti. Bull. Torr. Bot. Club, 46': 



157. 1919. 

 Stiles, Walter, Ingvar Jorgensen. Studies in permeability. The swelling of plant 



tissue in water and its relation to temperature and various dissolved sub- 

 stances. Annals of Botany, 31: 415. 1917. 

 , . Quantitative measurement of permeabihty. Botan. Gazette, 65: 526. 



1918. 

 SwARTZ, M. D. Nutrition investigations on the carbohydrates of lichens, algse, and 



related substances. Tran. Conn. Acad. Arts and Sciences, 16:247. 1911. 



P. 29. 

 Thodat, D. On turgescence and the absorption of water by the ceils of plants. New 



Phytologist, 17: 108. 1918. 

 Thompson, D. A. W. Growth and form. 1917. 

 ToTTiNGHAM, W. E. A quantitative chemical and physiological study of nutrient solutions 



for plant cultiu-es. Physiol. Res., l;No. 4. May 1914. 

 Ursprung, a. Die physikalischen Eigenschaften der Laubblatter. Bibliotheca Botanica, 



12 (Heft 60), 68. 1903^. 

 Wachter, W. Untersuchungen iiber den Austritt von Zucker aus den Zellen der Speicher- 



organe von Allium cepa imd Beta vulgaris. Jahrb. f . wiss. Bot., 41 : 165. 



1905. 

 ZsiGMONDT, R., translated by E. P. Spear. Chemistry of colloids, p. 222. 1917. 



