378 



DESCRIPTION OF PLATES. 



PLATE III, Is a Section extending through Mount Vesuvius to the Sea, see 



p. 194, 197,201. 

 PLATE IV. Fig. 1. A Diagram illustrative of the Paper on Vesuvius. It 

 should have been referred to in page 1 91. 

 Figs. 2, 3, Represent Lord Oxmantown's Apparatus for grinding 



and polishing the Specula of Reflecting Telescopes, p. 213. 

 Fig. 4. Singular Crystallization of Sulphuret of Lead, see p. 288. 

 Fig. 5, Crystals of Pyrolusite, p. 304. 

 Figs. 6, 7. Diagram illustrating Huygen's ideas respecting the 



structure of Calcareous Spar, p. 314. 

 Figs. 8, 9, Crystals of Herderite, a new Mineral, p. 360. 



EDINBURGH : 

 PRINTED BY JOHN STARK. 



