786 A^ E. Tolhert 



than control plants. These growth changes were similar to those 

 produced by high light intensity and the opposite from those caused 

 by gibberellin. The opposite types of growth induced by gibberellin 

 or (2-chloroethyl)trimethylammonium bromide counteracted each 

 other on the same plant. 



LITERATURE CITED 



1. Cathey, H. M. Changing growth and flowering of mums. Florist's Rev. 122: 

 25,26,30. 1958. 



2. Flaig, Von W., Scharrer, V., and Scholl, G. J. Zur Kenntnis der Huminsauren 

 XV, XVI and XVIII. Zeitschr. Pflanzenernahr. Dung. Bodenk. 76: 193-212. 

 1957. 



8. Krewson, C. P., Wood, J. W., Wolfe. W. C, Mitchell, J. W., and Marth, P. C. 

 Synthesis and biological activity of some quaternary ammonium and related com- 

 pounds that suppress plant growth. Jour. Agr. Food Chem. 7: 264-268. 1959. 



4. Tolbert, N. E. (2-Chloroethyl)trimethylammonium chloride and related com- 

 pounds as plant growth substances. I. Chemical structure and bioassay. Jour. 

 Biol. Chem. 235: 475^79. 1960. 



5. . (2-Chloroethyl)trimethylammonium chloride and related compounds as 



plant growth substances. II. Effect on the growth of wheat. Plant Physiol. 35: 

 380-385. 1960. 



6. Wittwer, S. H., and Tolbert, N. E. (2-Chloroethyl)trimethylammonium chloride 

 and related compounds as plant growth substances. III. Effect on the growth of 

 tomatoes. Amer. Jour. Bot. 47: 560-565. 1960. 



