EEEATA. 



SECTIOX A. 



Page 15, line 8, for m read rii^ 



,, „ 3 from bottom, for a read any 

 20, ,, 22, for SB read SA 

 25, ,, 25, for B read /8 



30, ,, 19, for \/m read m/A 



31, ,, 19, for = read = 

 35, ,, 17, for I read i 

 17, last line, for {y/l - l) 2 read (v/o - l)/2 



