CONTENTS. 



LETTER J. 

 INTRODUCTION. 



LETTER n. 



The Importance of >tud_ying Nature, with Reference to its 

 Author. - --...3 



LETTER III. 



On the Starry Firmament The Solar System The Immen- 

 sity of the Universe. - - 5 



LETTER IV. 



Description of the Earth Mountains Volcanoes. ........ J2 



LETTER V. 



Metals and Minerals Gold, Silver, Copper, IronReflec- 

 tions on their Nature and Uses.- - 17 



LETTER VI. 



Steel, Tin, Pewter, Quicksilver, Coal Precious Stones 

 Loadstone appropriate Reflections. - "51 



LETTER VII, 



On the atmosphere Winds Tides Clouds Rain-Snow 

 Hail Thunder, and Lightning Evaporation Reflections 

 eu the Symmetry of the Universe. - - -24 



ft 



