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Does not have any copies of paper on Newton to hand, but will send one if he finds one [JJS. "On an elementary proof & generalisation of Sir Isaac Newton's hitherto undemonstrated rule for the discovery of imaginary roots". Proceedings of the London Mathematical Society. Vol. 1 no.2, 1865.]

In latest issue of Comptes Rendus Poulain states that Campbell originated the rule usually ascribed to Newton, for determining the existance of imaginary roots in algebraic equations. Enquires whether this is true and whether JCA knows who Campbell was.