ERRATA. 



The reader is requested to make the following corrections 

 Page 7, line 5, for outlines read outliers. 



,, „ 6, insert, the granite, after touching. 



14, „ 21, for position read portion. 



15, „ 6, ,, run „ rim. 



16, „ 12, „ second „ sacred. 

 21, „ 7, „ crooks ,, geodes. 



„ „ 21, „ position „ portion. 



