Vlli ERRATA, ALTERATIONS AND ADDITIONS. 



P. 88, 1. 4 fr. top, for powers rea.d forms; 1. 13 fr. top, for Souri 

 read Sauri; 1. 22 fr. top, after way add, l{ c^ -\-d'' =m'^ -{•n'^ , then 

 2{c''+d')=ci''-\-l3^=y^-\-S%hc.; 1. 7 fr. bot., for (a^-fg^) read 

 (a2 4.g=')2; 1. 6 fr. bot., for (a2+g)2 read {o^^ -\-^^)'-, p. 89, bot. 

 line, for 2a r^d 2a; p. 90, top line, for a.aS^yZ ^.q^^ a-l-oc§^7^. 



p. 96, 1. 9, fr. bot. for^:r2+— 3-2:34-^2:3:4, 



reaa ^.2 2 "^ a;-^ 2-3 ''" x-* 2-3-4' 



w— 1 w— 1 n-1 _ . n—\ 



"100,1. 8, fr. bot. for a— r — ^"-2^0,-——, read a "y"'^" ^* +« — ^ . 



n — 2 _w — 2 , ^w-2 . w— 2 



1, 7. fr. bot. for /3-^a;"-3t/3-Y-, read ^-^— a;"-='»+ /3-y — 



ji— 3 n — 3 n-3 n — 3 



1. 6, fr. bot. for 7— r- ^"~**V^~j read y-r — a:""** +7^^ — 



n—A n — 4 .'^ — 4 n — 4 



1. 5, fr. bot. ■ for 5— 7— a;"~^i(5— ^, read o—j-x"~H-\-6-t-' 



1. 2, fr. bot. for qi, read g-i^. 



p. 101, 1. 7, fr. bot. for nx^'^x, read nx^'^x'. 



p. 145, 1. 7 fr. bot. for sempervirens, read glaucescens. 



