The Conditions Determinative of Chemical Change: Some Comments on Prof. Armstrong's Remarks

IN a paper (NATURE, vol. xlviii. p. 237, Proc. Chem. Soc. 1893, 145) bearing the above title, Prof. Armstrong discusses the phenomena of contact action, particularly those of the kind described by Mr. H. B. Baker. The whole discussion appears to us to be based on erroneous conceptions and to call for some criticism, first, on the general position assumed by him and, second, of the details which he brings forward to support that position.