The $B$ meson, decaying into ${\omega }^0+{\pi }^{\pm }$, has been observed in $\overline{p}p$ annihilations at rest in the reaction $\overline{p}+p\to {\omega }^0+{\pi }^{+}+{\pi }^{-}$. The mass and width of the $B$ meson as observed in this reaction are $M=1200\mathrm{}\pm 20$ MeV and $\Gamma =100\mathrm{}\pm 30$ MeV.

The phenomenological assumption is made that the electric dipole operators at infinite momentum have components both in the (8, 1) and (1, 8) representation of the collinear group and in the (3, 3*) and (3*, 3) representation. Under this assumption, the algebra of dipoles, in the usual configuration mixing scheme, provides very accurate relations for the baryon magnetic moments and charge radii. The over-all scheme seems thus capable of consistent predictions for all low-energy baryon parameters.

Equilibrium charge distributions of ${}_{}{}^{79}{}_{}{}^{}\mathrm{Br}$ and ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$ ions have been obtained with an electrostatic analyzer. Influences of ionic shell structure upon the charge distributions have been found. Thin carbon foils (8-78 μg/${\mathrm{cm}}^2$) have been used to observe the approach to charge-state equilibrium.

We discuss a recent classification of isoelectronic donors and acceptors by Hopfield, Thomas, and Lynch and show that a different interpretation of certain of their spectra is possible if one considers indirect transitions, with angular-momentum change accomplished by phonon emission.

The significance of the "string" attached to the Dirac magnetic monopole is reviewed. A mechanism proposed by Schiff, to explain the absence of free quarks in nature, is shown to be invalid.

Radio pulses from air showers were detected in conjunction with the Bolivian Air-Shower Joint Experiment air-shower array, which permitted measurement of shower size, arrival direction, and core location. For the first time, good correlation has been found between the shower arrival direction and the antenna pattern and between the shower size and the frequency of radio pulses; some correlation has been found between the radio-pulse height and the shower size and between the shower core location and the antenna position.

It is pointed out that the existence of secondary Regge trajectories with intercepts $\alpha \mathrm{}\left(0\right)\mathrm{}$ which differ by integers from that of the leading trajectory at $t=0\mathrm{}$, and residues which are singular at that point, is a very general phenomenon which should occur both in the scattering of particles with spin, and in the scattering of particles of unequal mass. Rules are given for determining if such trajectories exist, and for determining their properties. The case of nucleon-nucleon scattering is discussed as an example.

The thermal expansion has been measured as a function of temperature for U${\mathrm{O}}_2$ and shows a first-order transition at the Néel temperature. Elastic constants versus temperature also display a first-order transition except for $C_{44}$, which shows a lattice-spin effect 100° above the transition.

The angular correlation of positron annihilation radiation in potassium metal is found to be dependent on the magnetic field orientation. The experimental results are interpreted using the spin-density-wave model of the electronic structure of potassium metal.