The upper limit of the ratio of $K^0$ production from the neutron to that from the proton at forward c.m. angles is determined experimentally. This limit is about 20 times less than the ratio predicted on the basis of quark wave functions, at the energies of this experiment. The maximum $Q$ value for these reactions is 240 MeV, with forward three-momentum transfers in the range 260-390 MeV/c.

Assuming that in the asymptotic region of large $S$, the ${\pi }_{l3\mathrm{}}$ and $K_{l3\mathrm{}}$ form factors $f\left(S\right)\mathrm{}$ and $F_{+}\mathrm{}\left(S\right)\mathrm{}$ are related by the SU(3) symmetry, a superconvergence relation is suggested, from which, on saturation by the $\rho$ and the $K^{*}$, we obtain the approximate result $F_{+}\mathrm{}\left(0\right)=-\frac{\left(\frac{1}{\sqrt{2}}\right){M_{\rho }}^2}{{M_{K^{*}}}^2}$.

The $\overline{p}p$ elastic-scattering differential cross section shows a minimum at $t\sim 0.5$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ and a secondary maximum at $t\sim 0.9$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The total cross section for the annihilation process $\overline{p}+p\to {\pi }^{-}+{\pi }^{+}$ is 6.6±3.5 μb; the cross section for $\overline{p}+p\to K^{-}+K^{+}$ is <2.2 μb.

The special features of forward pion photoproduction at high energies are discussed. It is established that the cross section for single pion production can generally be expected to have a forward dip barring a conspiracy between Regge trajectories. Photo-production of the $A_1$ ($1^{+}$) meson followed by its decay is suggested as an important source of high-energy forward pions.

A necessity condition is proved for the set of polarization measurements which have to be performed for a full determination of the scattering amplitudes at fixed angles. The special cases of resonance scattering, Regge poles, and potential scattering are discussed.

Fine structure observed in the ${}_{}{}^6{}_{}{}^{}A_{1\mathrm{g}}^{}{}_{}{}^{}\mathrm{}\left(S\right)\mathrm{}\to {}_{}{}^4{}_{}{}^{}T_{2\mathrm{g}}^{}{}_{}{}^{}\mathrm{}\left(D\right)\mathrm{}$ band in the absorption spectrum of RbMn${\mathrm{F}}_3$ at 77°K has been assigned to the spin-orbit splitting of the ${}_{}{}^4{}_{}{}^{}T_{2\mathrm{g}}^{}{}_{}{}^{}\mathrm{}\left(D\right)\mathrm{}$ level, and the analysis yields a value of 320 ± 10 ${\mathrm{cm}}^{-1\mathrm{}}$ for the parameter ${\xi }_{3d}$.

Landau damping in plasmas of equal ion and electron temperatures (alkali plasmas) may prevent the formation of a shock. Shocks are produced when the ratio $\frac{T_e}{T_i}$ is increased to about 8 or so by cooling the ions through $i-n$ collisions.

The coexistence curve of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been measured by a dielectric constant technique in the neighborhood of the critical point. The parameters in the relation $\left|\frac{(\rho -{\rho }_c)}{{\rho }_c}\right|=A{\left[\frac{(T_c-T)}{T_c}\right]}^{\beta }$ are found to be ${\rho }_c=0.04134\mathrm{}$ g/${\mathrm{cm}}^3$, $T_c=3.3095\mathrm{}°$K, $A=1.323\mathrm{}$, and $\beta =0.362\mathrm{}$. Our value of $T_c$ is some 14 mdeg lower than previous measurements indicate, and our value of $\beta$ more nearly in agreement with values characteristic of other fluids than was previously found.

Starting from the helium interatomic potential for isolated atoms and the difference between the volume per atom of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ in solution, an effective ${\mathrm{He}}^3$-${\mathrm{He}}^3$ interaction is derived and used to calculate the solution properties (specific heat, magnetic susceptibility, ${\mathrm{He}}^3$ "sound velocity," spin diffusion, thermal conductivity, viscosity, and maximum solubility) for small concentrations of ${\mathrm{He}}^3$.

Data and calculations are presented for ${\mathrm{Ce}}^{3+}$ in a number of ethyl sulfates which show clearly that there is a large magnetic moment anomaly arising from the virtual phonon mechanism postulated by Inoue.

Contrary to the recent experimental results of Sharvin, we have observed that the laminas characteristic of the intermediate state in type-I superconductors do not move under the influence of a transport current.

Exact results for the interfacial and boundary free energies (for free and for ferromagnetic boundaries) are presented for the square, triangular, and honeycomb Ising lattices. The boundary energies and specific heats diverge as $\ln |T-T_c|$ and ${(T_c-T)}^{-1\mathrm{}}$, respectively. This behavior is interpreted generally in terms of the rounding and displacement of the specific-heat maximum in a finite system.