172 
Corrigenda, p. 142, Ac. 
In the group of order G'4‘2, for ^2 3 rea< ^ ^2 3+ ^41 ’ 
in that of the order 5 - 2, erase 10^ ; 
in the second title, page 144, for 4 93 p read 4^ 92 ; 
in the eighth title of that page , for 12^ 92 + 8 g read 4^ 9a + lGg; 
in the ninth title, p. 142, for 4g read ^2 3 l 2 > 
in the title S'G^^, for 522 3 p + 24^ 92 read 282 3 p + ^^42 2 + ^41 4 ' 
Addenda. 
4= 1 + 322, Q = l- 
6'2 = 1 + 3 9 „p + 8g 2 , Q = 15. 
6'4 = 1 + 6 ^ j 2 + 3 9 oj 2 + Sg 2 + ®2 3 ’ Q = 15. 
8 - 4 = 1 + 622^4 + 13 2< + 12 4 „ Q = 210. 
8*4 = 1 + 62’p + 4^2 + + 16^22, Q ~ 315. 
8'4 = 1 + 6 92 j^4 + 4^2 + ^24 + 13g, Q = 315. 
8'4 = 1 + 8 4 2 + 5 24 + ^2°-V ®2 3 1 2 ^8’ Q = 330. 
8'8 = 1 + 1 ©22^4 + ®421 2 "** 4^2 + ^24 + lGg + 13 4 2 2 > Q = 315. 
8’8 = 1 + 4^ 4 + + ^22^4 + 5g4 + 20^ + ^O^a, Q = 315. 
8 - 6'4 = 1 + ^ 2 2 1 4 ^4 2 13£‘ 32g 2 ^2 + 32^2 + 3423^2 + 
1^4pi + ^®8 + ^^42 3 * Q = 105. 
The omission of the above-given groups of 6'2 and 6'4 in my first 
processes was the main cause of the above errors and defects. 
