The following topics are considered: 1. Time as coordinate, introduction of proper time through a metric of space time. 2. Geometrical description of matter, the cosmical constant as a second constant demanded by the logical structure of the theory. 3. Detailed computation of the gravitational equations for a general non-static field of spherical symmetry. 4. Schwarzschild's and de Sitter's solutions free from artificial singularities. 5. Map representation of elliptical space, expanding space, Friedmann's equation, reduction to elliptic functions, numerical results. 6. Geodesics of space time, application to proper velocities and red-shift. Discussion of the time scale, numerical value of the cosmical constant, data on density. 7. Use of statical coordinates, the instability of Einstein's universe when no restriction is imposed on the symmetry of fluctuations, formation of the nebulae from fast-moving clouds of gases. 8. Discussion of the problem of the clusters of nebulae. 9. The cosmic rays as remnants of primitive matter. Explanation of the large amount of hydrogen and helium in the stars.

Radioactive decay data are used to calculate the atomic masses of the heavy isotopes, $A>~202$. The data have been critically surveyed; in some cases they have been supplemented by construction of tentative energy level schemes or by estimates of decay energies. With the adoption of certain assumptions a connection between the different radioactive families is made possible. The masses thus obtained have been tabulated and plotted. Atomic weight 209 on the Weizsaecker-Fermi formula is found to be unsatisfactory for the calculation of the masses, results deviating by as much as 0.020 mass units from those obtained by experimental data if the latter be adjusted to the calculated ones in the region of lead.

Cosmic rays produce nuclear disintegrations which may be studied by the use of proportional counters. Such counters may measure slow neutrons by capture, fast neutrons by recoil, and protons. These counters will have backgrounds produced by giant showers, contamination alpha-particles and other highly ionizing processes. The counters will in general count several of these quantities simultaneously. In this paper we discuss how the counting rates produced by each of these events may be separated and evaluated. This is done by varying the shielding, counter size, pressure and nature of filling gas, and other parameters.