Concentrations of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), and manganese (Mn) were examined in September, 1969, in leaves of different ages from different parts of the crowns of twelve 30- to 33-year-oldPinusbanksianaLamb. growing in a natural stand on coarse glacio-fluvial soil in northern Ontario. Although considerable tree-to-tree variability did occur, it was not sufficient to obscure differences related to crown position and leaf age, except in the case of N, where no trends were demonstrable. Foliar P, K, and Mg concentrations were shown to decrease with increasing leaf age, whilst foliar Ca, Fe, and Mn concentrations were shown to increase. From top to bottom of the crown, foliar P, K, and Fe concentrations decreased, whilst Ca and Mn concentrations increased. For Mg, no trend relative to crown position was discernible. Coefficients of variation were calculated and compared as were numbers of sample trees needed for statistically reliable samples.