Results are presented of rocket and meteor research in the upper atmosphere during the past three years. Both methods have been valuable in determining the pressures, densities and temperatures in the upper atmosphere and variations with time and place above an altitude of 30 km. The basic atmospheric data are now rather well determined to 130 km over New Mexico. Knowledge of the composition of the atmosphere to 72 km depends solely upon rocket sampling techniques. A great deal of information has been obtained from the rocket measures concerning radiation from the sun in the far ultraviolet to wavelength about 800 Å and in the soft X-ray region below 20 Å. A considerable section of the paper is devoted to the question of micro-meteorites, their existence and effect on the upper atmosphere. In addition, three Appendixes include some more recent information concerning temperatures and composition of the upper atmosphere and concerning high-frequency solar radiation.