ROOT ABSORPTION 
LITERATURE CITED 
1. True, R. H., and Bartlett, H. H. Absorption and excretion of salts by roots 
as influenced by concentration and composition of culture solutions. I. 
Concentration relations of dilute solutions of calcium and magnesium nitrates 
to pea roots. U. S. Dept. Agri. Bur. PI. Ind. Bull. 231. 1912. 
2. True, R. H., and Bartlett, H. H. The exchange of ions between the roots of 
Lupinus albus and culture solutions containing one nutrient salt. Amer. 
Journ. Bot. 2: 256, 264, etc. 1915. 
3. Roberts, E. A. The epidermal cells of roots. Bot. Gaz. 62: 488-506. 1916. 
4. Stiles, W. On the interpretation of the results of water culture experiments. 
Annals of Botany, 30: 427. 1916. 
