ERRATA ET CORRIGENDA. 



Pages 40-68, passim, for " Trig's Station " read " Trigonometrical Station." 

 Page 519, Explanation of figure, for M Fig. 1 " read " Fig. 2." 

 Page 520, Explanation of upper figure, for " Fig. 2 " read "Fig. 1." 

 Page 520, Explanation of Fig. 3. for " Section" read " Plan." 

 Page 523, line 16, after " breadth " add " of a large block of it." 

 Page 542, line 2, for " Worcestershire " read " Warwickshire." 



