PLATES. 



I. Plate illustrative of the Rev. J. Blackburn's Parabolic Sounding 

 Board. 



II. Plate illustrative of Mr. Dr la Beche's Paper on the Excavation 

 of Valleys. 



Errata. 



P. 76, line 19, for hyposulphate read hyposulphite. 



26, for oxyhydroiis 7-e«rf anhydrous. 



30, for lime read calcium. 



31, for hyposulphate read hyposulphite. 



32, for sulphate read sulphite. 



34, for hyposulphates and sulphates read hyposulphites and sul- 

 phites. 



P. 215, line 6, for connected read converted. 



25, for fusus read fucus. 



In the Plate accompanying Mr. De la Beche's Paper on the Excavation 

 of Valleys, the gravel strewed on the sides, and which occurs in 

 the bottom of the valley, fig. 1, (section of Charmouth Valley) is 

 represented too thick. 

 P. 254, line 1 7. for low pressure read low temperature. 



