532 Proceedings of Royal Society of Edinburgh. [sess. 
or 
a 
4/3 
5y 
28 
2y 
s 
2a 
5/3 
4y 
8 
a 
■2/3 
7 
(- 1) 2 
6 4 
if we denote the four differential-quotients by 2a, 6/3, 6y, 23 
respectively. As, however, the operations 
rowj - 2 row 3 , ^ 3 , row 3 + 2 rowj 
change the last determinant into 
P 
-20 
2y 
0 
a 
~7 
8 
2/3 y 
that is to say, into the result of Eisenstein’s substitution, the 
summary of our operations is 
3 
~ 6 4 
l 3,4 
whence we have 
H(I„) = ~(l 3 f 2 
( Issued separately January 16, 1907.) 
