I. On seeing in Nature (June 29, 1935) a summary of the paper “The Lunar Atmospheric Pressure Inequalities at Glasgow,” recently published in these Proceedings by Robb and Tannahill (1935), I wrote to Mr Robb (with whom I had had correspondence and discussion on the same subject in 1926) to point out that a certain “convex effect” discovered by Bartels was probably the main cause of their results. It was fortunately not too late for the authors to refer to this point by adding two sentences at the end of their paper. But despite this addition I fear that their paper will produce a wrong impression on almost all its readers, particularly since no reference was given to Bartels' paper. It seems, therefore, desirable to state that the inequalities described in their paper are not lunar in any real sense. This is strictly true for the major (diurnal) component of the inequalities, and substantially true for the semidiurnal component. It is of some interest and importance to demonstrate this to the many readers of the paper who will not have previous acquaintance with the subject or ready access to its literature.