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In No. 4 of this periodical King stated that on redetermining the crystal structure of strontium he found a cubic face-centered lattice in agreement with our measurements,' but that the unit cubic edge (as= 6.075 ='= 0.004 A.U.) was 0.7% greater than ours, which figured 6.03 A.U. King believes that this rather considerable discrepancy is due to the fact that his measurements, which were carried out with a view to obtaining very accurate results, were more exact than ours. We feel bound to point out that this is not the reason, but that our spacing applies to liquid air temperaturea fact that King has apparently overlooked-whereas his value holds for room temperature. The difference in question cannot be calculated accurately but can be gauged at 0.03 A.U. 10% by the usual approximation as shown in our paper. Computed for room temperature our result would thus be 6.06 A.U. The difference between this value and King's is within the limits of our experimental error. We will not discuss the question whether our value or King's is the more accurate, but we may mention that in a recent paper Ebert2 gives the unit cubic edge of strontium as 6.05 A.U. at room temperature.

Note on Mr. King's Paper: "The Crystal Structure of Strontium"