6. A Water Culture Technic for Studies in Tobacco Nutrition 1

In studying problems of nutrition of the tobacco plant by means of water cultures at the Massachusetts Experiment Stati6n, some methods and devices have been developed which may be helpful in similar studies with tobacco and other plants having some similar characters. Tobacco plants have been grown under conditions of partial and complete sterility. Four devices and methods of using them will be described. In the study of the assimilation of different forms of nitrogen, it has been necessary to change the nutrient solution frequently, sometimes daily. It was soon discovered that the jar jacket suggested by Shire 3