Errata for Vol. 90 The Abundances of the Elements, HAROLD C. UREY [Phys. Rev. 88, 248 (1952)]. On page 252, the abundances of bismuth are given incorrectly by a factor of 10. The percent should be 2 × 10⁻⁵, and the atomic abundance in the third column should be 0.0014. This atomic abundance is also given incorrectly in The Planets (Yale University Press, New Haven, 1952), second edition. Also, Kuiper's atomic abundance for argon should be 25,000 instead of 2500. Spherical Model of a Ferromagnet, H. W. LEWIS AND G. H. WANNIER [Phys. Rev. 88, 682 (1952)]. The authors want to amend their statement that all their results could be derived by their method to say that all thermodynamic properties can be so derived. A discrepancy arises in the sum Σᵢᵢ⁴, which equals 3N at all temperatures in their derivation, while in the original paper, it drops to N near absolute zero. This discrepancy contributes (2/N) to the relative fluctuation of D. Activation Cross Sections for 14-Mev Neutrons, STUART G. FORBES [Phys. Rev. 88, 1309 (1952)]. The caption to Fig. 1 is incorrect. The data are for Cu⁶² beta-rays, not for Cu⁶⁴. Nuclear Mass Determinations from Disintegration Energies: Oxygen to Sulfur, C. W. Li [Phys. Rev. 88, 1038 (1952)]. In Table III, the value of M-A for Mg²⁷ should be -6.633 ± 0.028 MeV, instead of -8.633 ± 0.028 MeV. In Table I, footnote a, the words "p. 000" should be replaced by "p. 1040." Theory of the Response of Organic Scintillation Crystals to Short-Range Particles, J. B. BIRKS [Phys. Rev. 86, 569 (1952)]. The probability of an exciton traveling a distance a from 0 is exp(-a/a₀)/a², not exp(-a/a₀). This modifies the expression for φ. Conversion of an Amplified Dirac Equation to an Approximately Relativistic Form, W. A. BARKER AND Z. V. CHRAPLYVY [Phys. Rev. 8Errata for Vol. 90 The Abundances of the Elements, HAROLD C. UREY [Phys. Rev. 88, 248 (1952)]. On page 252, the abundances of bismuth are given incorrectly by a factor of 10. The percent should be 2 × 10⁻⁵, and the atomic abundance in the third column should be 0.0014. This atomic abundance is also given incorrectly in The Planets (Yale University Press, New Haven, 1952), second edition. Also, Kuiper's atomic abundance for argon should be 25,000 instead of 2500. Spherical Model of a Ferromagnet, H. W. LEWIS AND G. H. WANNIER [Phys. Rev. 88, 682 (1952)]. The authors want to amend their statement that all their results could be derived by their method to say that all thermodynamic properties can be so derived. A discrepancy arises in the sum Σᵢᵢ⁴, which equals 3N at all temperatures in their derivation, while in the original paper, it drops to N near absolute zero. This discrepancy contributes (2/N) to the relative fluctuation of D. Activation Cross Sections for 14-Mev Neutrons, STUART G. FORBES [Phys. Rev. 88, 1309 (1952)]. The caption to Fig. 1 is incorrect. The data are for Cu⁶² beta-rays, not for Cu⁶⁴. Nuclear Mass Determinations from Disintegration Energies: Oxygen to Sulfur, C. W. Li [Phys. Rev. 88, 1038 (1952)]. In Table III, the value of M-A for Mg²⁷ should be -6.633 ± 0.028 MeV, instead of -8.633 ± 0.028 MeV. In Table I, footnote a, the words "p. 000" should be replaced by "p. 1040." Theory of the Response of Organic Scintillation Crystals to Short-Range Particles, J. B. BIRKS [Phys. Rev. 86, 569 (1952)]. The probability of an exciton traveling a distance a from 0 is exp(-a/a₀)/a², not exp(-a/a₀). This modifies the expression for φ. Conversion of an Amplified Dirac Equation to an Approximately Relativistic Form, W. A. BARKER AND Z. V. CHRAPLYVY [Phys. Rev. 8