. Principles of agricultural chemistry [microform] . Fig. 52.—Nodules on the roots of the soy bean. The following facts are related to these theories: (i) Asobserved by Hellriegel, in a medium free from nitrogen the plantceases to grow while the nodules are developing, then suddenlybegins to grow vigorously as if it had a new source of nitrogen.(2) Young nodules contain more nitrogen than old ones. 226 PRINCIPI^ES OF AGRICULTURAL CHLMISTRY. s}:;ji i t. m Ac- • lKP,

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