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Published online by Cambridge University Press: 15 September 2014
(1) The cubinvariant J of a binary quartic being

its Hessian, H(J), is

Performing on this the operations

and on the result the operations

we obtain

The three-line determinant here is seen to contain c as a factor, because it manifestly vanishes when c is put equal to 0.
page 531 note * Of course not so spoken of by him at that date.