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100 u section 20 dist 30 mm roots 9 curves abscissa ampulla Average curves average values barley base c e d weight curve Carlsberg Comptes rend CONTENT AND REDUCED content per unit curves for Pept/R.W. d e r stro density determinations of peptidase dist from root distance dry material elongation gradient tube growth center hatched area Height Position Height Position mm histological Holt Holt er Holter individual curves investigated Linderstr°m-Lang lu e s maxima mean error Mean of 9 microtome move basipetally Nitrogen and reduced nitrogen content nitrogen determinations P-u from tip paraffin Pept RW Pept/N Peptidase and reduced peptidase content peptidase determinations peptidase per unit periblem plerom Position mm Height Position mm P-u Position mm plmol protoplasm quantities Rockefeller Foundation root cap root length root section root tip root tissue roots grow longer solution specific gravity titrated total matter unit of nitrogen unit of reduced vacuolization zone