Wild, Murray, and Rowe (1954) have recently presented strong evidence that coronal plasma oscillations are responsible for certain forms of solar radio noise. It may be of interest in this connexion to mention briefly some results, partly new, which we have obtained in a laboratory study of plasma oscillations. The interpretation of the experiments is not in all respects unambiguous, and we have not attempted any quantitative sealing from discharge tube to solar conditions?nor to the apparently allied problem of colliding nebulae?but there is at least some parallelism between the phenomena probably occurring in the different sources.