250 Plant Tissue Culture 



304. . 1917. Influence of the leaf upon root formation 



and geotropic curvature in the stem of Bryophyllum 

 calycinum and the possibility of a hormone theory of 

 these processes. Bot. Gaz. 63 : 25-50. 



305. . 1917. The chemical basis of axial polarity in 



regeneration. Science 46: 547-551. 



306. . 1918. Chemical basis of correlation. I. Produc- 

 tion of equal masses of shoots by equal masses of sister 

 leaves in Bryophyllum calycinum. Bot. Gaz. 65 : 150-174. 



307. MacDougal, D. T. 1926. Growth and permeability of cen- 



tury-old cells. Am. Nat. 60 : 393-415. 



308. Naylor, E. E. 1931. The morphology of regeneration of 



Bryophyllum calycinum. Am. Jour. Bot. 19: 32-40. 



309. 1 and Johnson, B. 1937. A histological study of 



vegetative reproduction in Saintpaulia ionantha. Am. 

 Jour. Bot. 24: 673-678. 



310. , and Sperry, J. J. 1938. Vegetative reproduction 



in Chlorophytum datum. Am. Jour. Bot. 25: 695-699. 



311. Nobecourt, P., et Dusseau, A. 1938. Sur la proliferation 



in vitro de fragments de vegetans et la formation de 

 tumeurs aseptiques. Sciences (rev. fran<j.) 20: 53-56. 



312. Okado, Y. 1920. Studien iiber die Proliferation der Mark- 



hohlenzellen im Stengel der Vicia faba. Bot. mag., Tokyo, 

 34: 19-34. 



313. Pearsall, W. H., and Priestley, J. H. 1923. Meristematic 



tissues and protein iso-electric points. New Phytol. 22: 

 185-191. 



314. Priestley, J. H. 1928. The meristematic tissue of the plant. 



Biol. Eev. 3: 1-20. 



315. . 1930. Studies in the physiology of cambial ac- 

 tivity. III. The seasonal activity of the cambium. New 

 Phytol. 29: 316-354. 



316. , and Swingle, C. F. 1929. Vegetative propaga- 

 tion from the standpoint of plant anatomy. Tech. Bull. 

 151, U. S. Dept. Agr., Washington, D. C. 



317. Riker, A. J., and Berge, T. O. 1935. Atypical and patho- 



logical multiplication of cells approached through studies 

 on crown gall. Am. Jour. Cancer 25: 310-357. 



318. Bobbins, W. J. 1941. Growth of excised roots and heterosis 



in tomato. Am. Jour. Bot. 28: 216-225. 



