DESCRIPTION OF THE PLATES. 



Plate 



I. An Illustration of the General Effects of Magnetism on an 



Artificial Globe. 

 II. The Nature of the Influence of Magnetic Globes on each other. 



III. Magnetism of the Solar System. 



IV. The two Hemispheres, exhibiting the general Lamination of 



the Crystalline Rocks, and the Direction of the Magnetic 

 Currents. 

 V. Ditto, North and South Poles. 

 VI. Transition of the Granite into Gneiss and Schist in a North- 

 erly Direction. 

 VII. Meridional Direction of the Mexican Mines. 

 VIII. Meridional Direction of the Mines of Cornwall. 

 IX. The Meridional Lamination of the British Islands. 

 X. Heaves. 



XI. Veins of Fractures obliterated by a New Cleavage. 

 XII. An Illustration of Right- and Left-hand * Heaves.' 



XIII. Isolated Masses of the Bounding Rocks in Veins of Fractures. 



XIV. Different Angular Position of Veins. 



XV. An Illustration of the relative Position of the Bunches of 



Mineral in Veins. 

 XVI. Sections of the Primary and Sedimentary Rocks. 

 XVII. Influence of Splits on the Accumulation of Mineral in Veins 



of Fractures. 

 XVIII. Silver Mine in New Grenada (Split Veins). 

 XIX. Gold Mine in New Grenada (Veins of Fractures). 

 XX. An Illustration of the Atmospherical Refraction, Tempera- 

 ture, &c. 

 XXI. The Parallelism of similar Minerals in Veins of Fractures, 

 showing the Meridional Action of the Metalliferous Currents 

 through the Pores of the Rocks. 

 XXII. Veins enclosed in the Laminae of the Schistose Rocks. 

 XXIII. The Nature of Faults in Coal-beds. 

 ,XXIV. An Illustration of the Composition of Forces. 



