780] 
409 
780. 
[ADDITION TO MR HAMMOND’S PAPER “NOTE ON AN EXCEP 
TIONAL CASE IN WHICH THE FUNDAMENTAL POSTULATE 
OF PROFESSOR SYLVESTER’S THEORY OF TAMISAGE 
FAILS.”] 
[From the Proceedings of the London Mathematical Society, vol. xiv. (1883), pp. 88—91. 
Read Dec. 14, 1882.] 
The extreme importance of Mr Hammond’s result, as regards the entire subject 
of Covariants, leads me to reproduce his investigation in the notation of my Memoirs 
on Quantics, and with a somewhat different arrangement of the formulae. For the 
binary seventhic 
(a, b, c, d, e, f g, K$x, y) 7 , 
the four composite seminvariants of the deg-weight 5 . 11 (sources of covariants of the 
deg-order 5 . 13) are 
1.7 4.6 2. 10 3.3 Deg-order. 
1.0 4.11 2.2 3.9 Deg-weight.