Abstract
1. The sulphur content, as determined by the sodium peroxide method, is of the same order as the phosphorus content in the apple tree tissues investigated. 2. The highest percentages of sulphur are found in the leaves, and then in descending order in spurs, young bark, and old bark. 3. The sulphur content varies inversely with the phosphorus content throughout the year. 4. Sulphur resembles calcium in that it is not mobilized to any great extent. 5. The seasonal variation of sulphur is parallel with the H-ion concentration. 6. The percentage of sulphur is at a minimum in the apple spur at the time of fruit-bud differentiation.
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