ERRATA. 



Page 57, line 1 1 from bottom, for y read z. 



93, 5, for is read be. 



119, - 6, the letter w imperfect, like v. 



,, 10, for wx read wz. 



120, 1, last term, for z read z. 



1 28, 4 from bottom, for w read x. 



n 6 from bottom, for xw + x read xw + xw. 



8 from bottom, the letter w imperfect, like v f 



129, 2, for xyz read xyz. 



_ 221 , 18, for vy read vy. 



231, 10 from bottom, for vz read v'z. 



261, 2 from bottom, for p, q, r, read p, q, r. 

 262, 22, for p and q read p and q. 



270, 6 from bottom, for Xy read XY. 



274, 11, for t* t<i read t\ h. > 

 _ 282, - - 10, dele (1) gives. 



291, - 1, for y +yz read y + yz. 



297, 10 from bottom, prefix = 



308, 4, for limit read limits. 



_ 309, - 7, for sq (1 - read sy (1 - . 



313, 13 from bottom, for Si = read si = 0. 



314, 9 from bottom, omit the comma. 



315, 4 from bottom, for s\ $2 s read i s% . . *, 



322, bottom line, read the second term as ~s~txy. 



330, line 6, for v read ri. 



331, 5 from bottom, for p'm read h'm. 



334, - - 16, supply the letter s. 



351, 10 from bottom, for v\ read x\. 



364, 21, /or 91 4187 read 9l-4187. 



373, 7,forp = r read p - r. 



3, 5, and 6 from bottom, for 1 read 0. 



385, 6, for x m read x n . 



_ 386, -- 13, w imperfect, like v. 



388, -- 16, for tm-i read t m -i. 



389, 7 from bottom, for ti . . t m read ~t\ . . ~t m -^ 



. 391, 5, omit namely. 



