ERRATA. 
Page 
321, last line, for 0 + read 0 + 
323, line 17, for + © read + Oa, 
330, line 11, for pend read depend 
336, equations (121.) for 4 read b 
342, line 18, for For read For if 
347, 6th line from foot, for thorems read theorems 
360, last line but 2, for denote read denote by 
383, last line, for B read B 
384, line 7, for = read Ta 
387, equation (340.) for 1 + m read 1 + im 
391, before (358.) for formula read formule 
391, before (862.) for formula read formule 
391, last line, for one read one set 
394, line 10, for A, to By read A, to B, 
395, before (4.) for denote read denote it 
399, in (21.) for (a, a, 4 ) read (a, % , a a ) 
399, in (23.) for (> =) read 2 he ) 
2 2 
ay ay 
“I 
400, line 6, for (a 4, a, 4 ) read (a, 4 , a 4 ) 
400, last but 3, for retain read retain them 
401, before (37.) for (a,,0) read (a, a2 ) 
401, 2d formula (39.) for b, read by 
401, in (42.) for Bz read By 
402, end of (44.) for a, read ay” 
402, in (48.) for B® read By 
404, in (62.) for a? read az 
404, in (63.) for a,” +a) read a? + a” 
405, after (69.) for formula read formule 
407, in (78.) for (a",, a) read (a",, a’, ) 
407, in (79.) for a, a’, read a ay 
407, in (83.) for a,* —a® read a\* — ay? 
408, in (90.) for (a2, a2 )"—! read (a, , a2 )*—! 
410, in (104.) for nx1 read n+1 
410, in (107.) for mx1 read m+1 
417, in (151.) for (1, By) read (by , bs Jn 
421, in (182.) for (2 w' 7.0) read (2 w' mr, 0) 
