Abstract
1. A simple method has been suggested for determining the ratio between the length of tracheid-ray to total tracheid-wall contact that requires only the counting of structural elements. 2. A comparison between the results obtained with this method and with the direct-measurement method is given. 3. The values for this ratio obtained for all the different species of softwood examined range from 0.072 to 0.288. Values of the ratio for a given species vary considerably less, and, for different parts of the same specimen, still less. There is no significant difference between the values for summerwood and for springwood.
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