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7. GROOM, P. On the relation between calcium and the transportation of carbohydrates in plants. Annals Bot. 10: 91-96. 1896. 8. HIBBARD, R. P. and GRIGSBY, B. H. Relation of light, potassium and calcium deficiencies to photosynthesis, protein synthesis and translocation. Agr. Expt. Sta., Michigan Tech. Bull. 141: 3-39. 1934. 9. JOHAM, H. E. The calcium and potassium nutrition of cotton as influenced by sodium. Plant Physiol. 30: 4-10. 1955. 10. JOHNSTON, E. S. and DORE, W. H. The relation of boron to the growth of the tomato plant. Science 67: 324-325. 1928. 11. NIGHTINGALE, G. T., ADDOMS, R. M., ROBBINS, W. R. and SCHERMERHORN, L. G. Effect of calcium deficiency on nitrate absorption and on metabolism in tomato. Plant Physiol. 6: 605-631. 1931. 12. SKOK, J. Effect of the form of the available nitrogen on the calcium deficiency symptoms in the bean plant. Plant Physiol. 16: 145-157. 1941. 13. WADLEIGH, C. H. Growth status of the cotton plant as influenced by the supply of nitrogen. Agr. Expt. Sta., Arkansas Bull. 446. 1944. 14. WILDMAN, S. G. and HANSEN, E. A semi-micro method for the determination of reducing sugars. Plant Physiol. 15: 719-725. 1940.

Effect of 6-(Substituted)Thio- and Amino-Purines on Germination of Lettuce Seed.