ERRATA IN PART 1. 



Page 7, line 12 from bottom, for " their" read them, 



9, line 6 from bottom, for " ascertained" read ascertain, 

 11, line 3 from top, for " weaves" read waves. 

 19, line 14 from top, for " Gorgo" read Gongo. 



line 7 from bottom, for "lonora" read Sonora. 

 32, line 4 from bottom, for "ci-devant of the Spanish" read ci-devant 

 Spanish. 



39, lines 6 and 16 from bottom, for " Prestroich" read Prestwich. 



42, line 1, for " Chcslopus" read Cholmpus. 



43, line 3 from top, ditto. 



51, line 9 from top, for " American" read Animaux. 

 69, line 5 from bottom, for " M." read Megatherium. 

 112, last line from bottom, for " measurers" read measures. 

 149, 8th line from bottom, for " South Brooks" read South Brook. 

 151, 9th line from top, for " common slate" read talcose slate. 

 155, 10th line from top, for " earthy water" read earthy matter. 

 15th line from top, for " amalgamation" Tea,d amalgam. 

 12th line from bottom, for " amalgams" read amalgam. 

 8th line from bottom, for "parity" rea.d purity. 

 3d line from bottom, for " and we doubt" read and no doubt. 

 158, 7th line from bottom, for " principal veins" read principal vein. 

 In Fig. I. the letters C. and F. are omitted at the upper end of the straight 

 lines commencing at D. and E. 



