256 GROWTH OF PLANTS 



metabolic changes do not throw much Ught on the mechanism of the bud- 

 forcing action. 



These chemically induced metabolic changes are, however, of great 

 interest because they show in how many ways and to what degree the 

 chemical composition of plants and plant organs can be changed by the 

 introduction of foreign chemicals. 



Literature Cited 



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2. Arthur, J. M., and E. K. Harvill, "Flowering in Digitalis purpurea initiated by low 



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3. Astwood, E. B., "Treatment of hyperthyroidism with thiourea and thiouracil," 



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Am. J. Bot., 17 : 602-613 (1930); also in C. B. T. I., 2 : 523-534 (1930). 



10. , "Sucrose and starch changes in potatoes treated with chemicals that break 



the rest period," Am. J. Bot., 17 : 806-817 (1930); also in C. B. T. I., 2 : 580-591 

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sprouting of dormant tubers," C. B. T. I., 4 : 53-63 (1932). 



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