It is found that at small angles the scattering from a "permanent" gas diminishes due to intermolecular interference. The scattering cruves at various pressures closely resemble those of a liquid or solid. It is concluded that this is due to the closeness of the scattering centers rather than to any preferred orientation of molecular groups since it is unlikely that such groups would be present in a gas so far from the liquid state.

• Received 26 July 1934

DOI:https://doi.org/10.1103/PhysRev.46.441