The equations of Proka in the field of the plane wave are considered in this paper. When the energies of the incident quantum are large, a solution is reached in a closed form. On the basis of the solutions obtained, the diffusion of light on a meson is evaluated by the method of delayed potentials.

The principle of homogeneity among elements through mathematical possibilities is discussed.

In previous works the authors presented theories on collisions. In this paper the authors will discuss the determination of the effective cross section with exponential accuracy without the slowly varying coefficient.

Adsorption passivation of metals is discussed in this paper.

A short survey of diffusion processes in the atmosphere the coagulation of aerosol particles, the evaporation thereof and the evaporation of droplets from the view point that isotropic turbulence in involved.

Research on the difference for which interference can be observed depending on the width of the spectral line used.

A brief history of the development of the atomic bomb in the United States and Germany during World War II.

Corresponding investigations were carried out for rare earths. Fractional estimates of intensities and rough values of the activation cross sections with thermal neutrons for all earther are listed.

France took a place as one of the atomic nations on December 15, 1948 as the first French pile was started at the fort of Chetillon. Not intended for the making of bombs, the pile is to be used to find the techniques necessary for the realization of more powerful piles which are studied at the time.

The dependence of the ion output on several variables was studied thoroughly and the point of optimum operatio was determined. Mercury ions were used and certain observed effects were ascribed to the presence of heavier ions.

Progress report on the research and development in metallurgy.

The author reviews briefly the present state of several important problems of the electrochemistry and the chemistry of polonium; the position of this element in the electromotive series, the nature of the ions and the electrolytic deposits which they form, the valences, the nature of the precipitates of Po that is observed in solutions which are feebly acid or feebly alkaline.

The method for studying the electrochemistry of the radioelements has a great advantage which permits the observation of the chemical behaviour of these elements in a continuous and direct manner in a different media and comparison of the different reactions.

The study of the fat soluble compounds of a number of elements is very interesting work especially the salts of camphocarbonic acid.

Investigations on the case of vaporization of RaD, E, and F in a vacuum were conducted.

In previous research the authors shown that the rate of synthesis affects the yield of radioactive bromine. This rate must vary with the chemical composition of the starting material, ethyl bromide, ethlidene bromide, and bromoform were compared.

In continuation of the x-ray study of Ni-dimethylglyoxime and Ni-methylethylglyoxime, the Patterson xy plane projection is performed, and on the basis of the vectorial values and angles thus calculated a model of molecular structure is proposed which corresponds to the exigency of the crystallographic and physical-chemical property of the examined compounds.

After numerous attempts the author was successful in obtaining, through crystallizations from nitrobenzene, well-formed needles which are susceptible to measurement, even for the first members of the series of the salts of nickel with the glyoximes of the type (DH)2Ni.

The authors give the results of their work towards the development of effective methods for enrichment in light isotopes.

Vaporization studies were made with Po on Au, Pt and Pd supports. It was shown that Po is vaporized at a much higher temperature than from Au and Pt.

The theory of metallic diffusion should be facilitated if the regularity of the lattice is disturbed mechanically, or by means of an alletropic transformation.

The study of metallic diffusion in the solid state is a matter of determining the concentration of a solid solution as a function of time and temperature.

The question of the nature and charge of the metallic particles emitted in cathode sputtering has been answered experimentally: the particles are primarily neutral atoms. The proof was obtained from the moving particles themselves by a new "spectroscopic method of vapor pressure measurement" in combination with a "vapor pressure measurement from coating density."

The author describes a process by which he discovered a way of integrating the diffusion equation with variable diffusion coefficients.