ERRATA. 



By inadvertence of the photographer, the numbering of the figures in 

 Plate XXVI was put in wrong order. 



For " Fig. 1 " read " Fig. 4." For " Fig. 2 " read " Fig. 3." 

 - For " Fig. 3 " read " Fig. 2." For " Fig. 4 " read " Fig. 1." 



Also 11th line from the top, in the Explanation of Plate XXVI, for 

 " lower " margin read " upper " margin. 



Page 243, 7th hne from the bottom, for " Fig 7 " read Fig. 10." 

 Page 246, 11th line from the botton, for " feldspar" read " feldspar." 

 Page 256, 13th line from the top, for " wecJienjormig " read " wecTtenförmig ." 



