Series 1
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ops.RootsTops.RootsTops.Roots 16.2 cm.16.2 "34-5 "19.5 "41.617.0 " The length of tops continues about the same during these three series.No differences were observed as to health and vigor of these cultures, so theeffect of this more highly concentrated solution seems to be shown inbringing about a change in the morphological character of the root. Sincethe growth values in this solution relative to the medium-nitrate solution(which is the same as that used in Experiment I, both as to nitrate con-centration and as to total concentration) and in Solution Ilia are practicallythe same as they were where we had the reverse concentration conditions, itwould seem that the physiological processes underlying this change areof a different order and, being within the root itself, do not affect the ratio 43«
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