Abstract
Phillis and Mason1 claimed that ringing cotton plants interfered with the uptake of bromine by the root within a period of 2 h. Their experiment was strongly criticized on a number of points by Steward2, who concluded that there was no significant difference between the bromide uptake of their control and ringed plants. In reply3 they submitted data on the uptake of calcium which showed an effect of ringing only after three days. They extrapolated their figures and concluded that ringing checked the calcium uptake after 15.5 h.
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