244 Transactions of the Royal Canadian Institute 



1916a. — The abscission of flower-buds and fruits in Gossypium and 



its relation to environmental changes. Trans. Roy. Soc. Can. Ill, 



10: 55-61. Sept. 

 19 166. — The embryo-sac and pollen grain as colloidal systems. 



Mem. N.Y. Bot. Card. 6: 561-563. 31 Aug. 

 1917- — The colloidal properties of protoplasm: Imbibition in relation 



to growth, Trans. Roy. Soc. Can. Ill, 11: 133. (See also Ann. 



Rep. Carn. Inst. Wash, for 1916, 191 7, and 1918). 



1918. — The efi^ect of acids and alkalis on the protoplasm of pollen 

 tubes. Mem. Torr. Club 17: 84, 



1919. — The origin and nature of the mucilage in the cacti. Am. Jour. 

 Bot. 6: 156-166. Apr. 



1920. — Environmental changes and their effect upon boll-shedding 

 in cotton (Gossypium herbaceum). Ann. N.Y. Acad. Sci. 29: 1-131. 



1903. MacDougal, D. T., The influence of light and darkness upon 



growth and development. Mem. N.Y. Bot. Gard. 2: 1-320. 

 1915- — Light and the rate of growth in plants. Science, N.S. 41: 



467-469. 26 Mar. 

 1916. — The mechanisms and conditions of growth. Mem. N.Y. Bot. 



Gard. 6: 5-26. 

 1917- — and Spoehr, H. A., Growth and Imbibition. Proc. Am. Phil. 



Soc. 56: 289. 



1918. — The nature and course of growth in the higher plants. Ann. 

 Rep. Carn. Inst. Wash. 17: 58-59. 



1919. — The daily course of growth in two types of fruits. Ann. Rep. 

 Carn. Inst. Wash. 18: 69-70. 



1915. Richards, H. M., Acidity and gas exchange in cacti. Carn. Inst. 

 Wash. Publ. 209. 



1916. Shreve, Edith B., An analysis of the causes of variation in the 

 transpiring power of cacti. Physiol. Res. 2: 73-127. Aug. 



1906, Smith, A. M., On the application of the theory of limiting factors 

 to measurements and observation of growth in Ceylon. Ann. Roy. 

 Bot. Gard. Perad. 3: 370. Nov. 



1917. Spoehr (see MacDougal and Spoehr, 1917). 



1919. Spoehr, H. A., The carbohydrate economy of cacti. Carn. Inst. 



Wash. Publ. 287. 

 1919. Stewart, E. Grace, Mucilage or slime formation in the cacti. Bull. 



Torr. Bot. Club 46: 157-166. May. 

 1874. deVries, H. Die Resultate der neuesten Forschungen ueber den 



Laengenwachstum der Pflanzen. Reprinted in " Opera e periodicis 



collata, Utrecht. 1918. 



