Volume 21, Issue 19

W. H. Sims, J. R. Albright, E. B. Brucker, J. T. Dockery, J. E. Lannutti, J. S. O'Neall, B. G. Reynolds, J. H. Bartley, R. M. Dowd, A. F. Greene, J. Schneps, M. Meer, J. Mueller, M. Schneeberger, and S. Wolf

Phys. Rev. Lett. 21, 1413 (1968) - Published 4 November, 1968

Small-Angle $pd$ Scattering in the Momentum Range 1.3 to 1.5 GeV/c

L. M. C. Dutton and H. B. van der Raay

Phys. Rev. Lett. 21, 1416 (1968) - Published 4 November, 1968

Limits on High-Energy Weak-Interaction Cross Sections and the $W$ -Pair Strong-Interaction Model

C. H. Woo

Phys. Rev. Lett. 21, 1419 (1968) - Published 4 November, 1968

Associated Resonance Production in $π^{-} p$ Interactions at 6 BeV/c

E. D. Alyea, Jr., R. R. Crittenden, K. F. Galloway, K. Y. Lee, H. J. Martin, and K. F. Suen

Phys. Rev. Lett. 21, 1421 (1968) - Published 4 November, 1968

ERRATA

Positronium Diffusion in Solids.

Werner Brandt and Robert Paulin

Phys. Rev. Lett. 21, 1423 (1968) - Published 4 November, 1968

Solar Neutrinos and the Solar helium Abundance.

Icko Iben, Jr.

Phys. Rev. Lett. 21, 1423 (1968) - Published 4 November, 1968

Physical Review Letters

Volume 21, Issue 19

EDITORIAL

Length and the Nature of Letters

LETTERS

Low-Temperature Mobility of Heavy Impurities in Fermi Liquids

Excitons in AgCl

Optical Phonons in Some Very Thin II-VI Compound Films

Experimental Determination of the Effective Atomic-Scattering Factor and Rigid-Lattice Interference Function in Low-Energy Electron Diffraction

Inelastic Electron Scattering Studies from ${Ca}^{40}$ and ${Ca}^{48}$

Polarization in the Elastic Scattering of 22.7-MeV Protons from Deuterons

Elastic Electron Scattering from ${He}^{4}$

Hole-Particle States in ${}^{18}F$

Report on the Investigation of Mach's Principle in the Scalar-Tensor Theory of Gravity

Nonlinear Diffraction

$K^{+} p$ Elastic Scattering in the Backward Direction at 2.76 BeV/c

Measurements of the Polarization in $π^{\pm} p$ Elastic Scattering at 5.15 GeV/c

Partial-Wave Analysis of the Sequential Reaction $K^{-} N \to Y_{1}^{*} (1385) π \to Λ π π$ in the Center-of-Mass Energy Range 1600-1740 MeV