well as in view of our more complete spectra of both acids.Grateful acknowledgment is made of a National Youth Administration grant which secured us the able assistance of Mr. J. De Young and Mr. R. 0. Dhondt. summary 1. A new line 480 em.-' was found in the Raman spectrum of anhydrous nitric acid and interpreted as the frequency of the restricted internal rotation of the hydrogen. 2.Anhydrous deuteronitric acid, free of lower oxides, has been prepared, and its Raman spectrum was determined.3. All nine fundamentals were found in the spectra of nitric acid and deuteronitric acid. A complete interpretation is presented which, except for minor details, is believed to be a necessary consequence of the experimental results.4. The results are in accord with the product formula applied to symmetry C, (plane configuration). 5. The density of deuteronitric acid at 25.00" is 1.5228.6. The refractivities of nitric and deuteronitric acids at 25.0' are nD = 1.3920 and nD = 1.3909, respectively. This paper presents evidence to show that the deviations of observed from calculated polarographic diffusion currents have not been satisfactorily explained up to the present time. Fur-(11) E. W. Balia, Ph.D Thesis, Ohio State University, 1941.