Abstract
Open-ended paraffin-coated and uncoated pyrex glass tubes with diameters ranging from 1.3 to 4.0 mm were suspended in toxic solutions. Corn roots were inserted into the tubes and allowed to grow for twenty-three hours in the dark. The use of 3 me Li+/l as Li2SO4.H2O as the toxic growth solution resulted in a root growth difference between the glass and paraffin-coated tube that could be ascribed to the surface type. The growth difference was significant at the 5% level in the two smallest tubes.
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