CORRIGENDA. 



Page 79, six lines from top, for "finer" read "firmer." 

 „ 87, three lines from top, for "generation" read "gemmation." 

 „ 88, two lines from top, for "spiral " read "special." 

 „ 88, in the explanation of Tig. 30, for "broad" read "hrood." 



