16 MAGNITUDE, FIGURE, AND 



I, 



Magnitude, Figure, and Density of the Earth Internal Heat of the 

 Earth, and its Distribution Magnetic Activity, manifesting itself 

 in variations of Inclination, Declination, and Force Magnetic 

 Storms Polar Light, or Aurora. 



THERE is contained in all languages, though it may be 

 etymologically represented under different symbolical forms, 

 an expression equivalent to that of " Nature/' (and some- 

 times, as man is inclined to refer always primarily to the 

 seat of his own habitation, " Terrestrial Nature"), desig- 

 nating the result of the harmonious concurrent action of a 

 system of impelling forces, which are themselves only known 

 to us through their effects in the production of motion, 

 combination, and separation, and partially in the formation 

 of organic tissues (living organisms), which reproduce their 

 like. " Naturgefiihl," the feeling for, or sentiment of 

 Nature, is, in dispositions accessible to such impressions, the 

 vague, but exciting and elevating impression of this general 

 systematic action. Curiosity is first arrested by the rela- 

 tions in space and magnitude of our planet, a globular mass 

 of almost imperceptible minuteness in the immeasurable 

 universe. A system of concurrent activities uniting, or (by 

 polar action) separating, substances, supposes dependence of 

 each particle on the others, in the elementary processes of 

 inorganic formation, as well as in the elicitation and main- 



