The errata section for Volume 90 of a scientific journal includes corrections to various articles. Specifically: 1. **Abundances of Elements by Harold C. Urey**: The abundances of bismuth are incorrectly given by a factor of 10. The correct percent abundance is $2 \times 10^{-5}$, and the atomic abundance is 0.0011. Kuiper's atomic abundance for argon should be 25,000 instead of 2,500. 2. **Spherical Model of a Ferronorm by H. W. Lewis and G. H. Wanner**: The letter corrects the claim that all thermodynamic properties can be derived using a different statistical ensemble. A discrepancy is noted in the fluctuation of $\Sigma_{i} \epsilon^{i}$, which equals $3N$ at all temperatures in the original paper but drops to $N$ near absolute zero in the letter. 3. **Activation Cross Sections for 14-Mev Neutrons by Stuart G. Fowler**: The caption to Fig. 1 is incorrect, as the data are for $\mathrm{Cu}^{64}$ beta-rays, not $\mathrm{Cu}^{64}$. 4. **Nuclear Mass Determinations from Disintegration Energies by C. W. Li**: The value of $M-A$ for $\mathrm{Mg}^{27}$ should be $-6.633 \pm 0.028 \mathrm{Mev}$, not $-8.633 \pm 0.028 \mathrm{Mev}$. 5. **Theory of the Response of Organic Scintillation Crystals by J. B. Birks**: The probability of an exciton traveling a distance $a$ is $\exp (-a / a_{0}) / a^{2}$, not $\exp (-a / a_{0})$. This modifies the expression for $\phi$. 6. **Conversion of an Amplified Dirac Equation by W. A. Barker and Z. V. Chrapyyev**: Two second-order terms in Table I are dimensionally incorrect. The fourth spin-field term and the first spin-orbit term are corrected. 7. **A Third Rydberg Series of $\mathrm{N}_{2}$ by R. Edwin Worley**: The paragraph beginning with "Professor Mulliken . . ." should start with its last sentence. 8. **Macroscopic Theory of Superfluid He$^{4}$-He$^{4}$ Mixtures by P. J. Price**: Equation (15') is incorrectly stated and should be read as \( w^{*}=e w S^{*} / S \). 9. **Impurity Diffusion and Space Charge Layers in a Fused Impurity $p-n$ Junctions by J. S. Sabby and WThe errata section for Volume 90 of a scientific journal includes corrections to various articles. Specifically: 1. **Abundances of Elements by Harold C. Urey**: The abundances of bismuth are incorrectly given by a factor of 10. The correct percent abundance is $2 \times 10^{-5}$, and the atomic abundance is 0.0011. Kuiper's atomic abundance for argon should be 25,000 instead of 2,500. 2. **Spherical Model of a Ferronorm by H. W. Lewis and G. H. Wanner**: The letter corrects the claim that all thermodynamic properties can be derived using a different statistical ensemble. A discrepancy is noted in the fluctuation of $\Sigma_{i} \epsilon^{i}$, which equals $3N$ at all temperatures in the original paper but drops to $N$ near absolute zero in the letter. 3. **Activation Cross Sections for 14-Mev Neutrons by Stuart G. Fowler**: The caption to Fig. 1 is incorrect, as the data are for $\mathrm{Cu}^{64}$ beta-rays, not $\mathrm{Cu}^{64}$. 4. **Nuclear Mass Determinations from Disintegration Energies by C. W. Li**: The value of $M-A$ for $\mathrm{Mg}^{27}$ should be $-6.633 \pm 0.028 \mathrm{Mev}$, not $-8.633 \pm 0.028 \mathrm{Mev}$. 5. **Theory of the Response of Organic Scintillation Crystals by J. B. Birks**: The probability of an exciton traveling a distance $a$ is $\exp (-a / a_{0}) / a^{2}$, not $\exp (-a / a_{0})$. This modifies the expression for $\phi$. 6. **Conversion of an Amplified Dirac Equation by W. A. Barker and Z. V. Chrapyyev**: Two second-order terms in Table I are dimensionally incorrect. The fourth spin-field term and the first spin-orbit term are corrected. 7. **A Third Rydberg Series of $\mathrm{N}_{2}$ by R. Edwin Worley**: The paragraph beginning with "Professor Mulliken . . ." should start with its last sentence. 8. **Macroscopic Theory of Superfluid He$^{4}$-He$^{4}$ Mixtures by P. J. Price**: Equation (15') is incorrectly stated and should be read as \( w^{*}=e w S^{*} / S \). 9. **Impurity Diffusion and Space Charge Layers in a Fused Impurity $p-n$ Junctions by J. S. Sabby and W