Accident has recently called my attention to a work entitled Essays on Scientific Subjects, by Robert Blair, Regius Professor of Practical Astronomy in the University of Edin. (Edin. 1818). In the University Library there is a second edition of a part of the same work with the title Scientific Aphorisms (Edin. 1827). I bring them before the notice of the Society, as they contain an explanation of gravitation, &c., almost identical with that of Le Sage, to which our attention was lately recalled by our President. Professor Blair seems to have invented this explanation for himself—because, though he gives frequent references to other authors, whose results he quotes, he makes, so far as I have seen, no reference to Le Sage.