ERRATA. 



Page 2, foot-note, second line : For '' there" read ''these." 

 Page 4, L. libatrix, first line: For '' undistinguishable " read "indistin- 

 guishable. ' ' 

 Page 17, line 11 : For "western" read "eastern." 

 Page 67, table 10, Under 7, for '^ a ~{- b -\- c-\- e +/' ' read '' a -]- b — d -\- e -\- 



/". Under 8, for " «'+ b'-\- c + €-\- | ^/' read " a -V b'-\- d'-^ e — | ^'." 



Page 80, table 25, top of second column : For " Per cent of value in modal 



class" read " Per cent in Modal class." 

 Page 91, table 32 : I^ine 8, first column, " 14 " set in wrong font. 

 Page 108, table 41 : Line 17, " 98 " set in wrong font. 

 Page 309, legend of text-figure 31 : Add a=^L. albida. 

 Plate 25, in legend, last line : For " shade " read " shape." 



