m\ 



SOLAR SPOTS OBSERVED IK 1826 AKD 1828 BY MM. CAPOCCI AXD PASTORFF. 



Capocci 1. Sept. 29 ; 2. Sept. 2 ; 3. July 1, 1826. 

 Fastorn i. Sept 27, 1826 ; 5. May 21 ; 6. Jiiue 21, 1828. 



THE SUN. 



1. An object of great interest. 2. Its distance. 3. Magnitude. 4. 

 Illustrations. 5. Its volume. 6. Mass or weight. 7. How ascer- 

 tained. 8. Application of this principle. 9. Its density. 10. Form 

 and rotation. 11. Determined by the appearance of spots. 12. Dis- 

 covery of Solar spots. 13. Their great magnitude. 14. Their rapid 

 changes. 15. Hypotheses to explain them. 16. They are excavations 

 in the luminous coating. 17. Their prevalence varies. 18. Observa- 

 tions upon them. 19. Their dimensions. 20. Facules and Lucules. 

 21. Physical state of the Solar surface. 22. Luminous coating is 

 gaseous. 23. Gaseous atmosphere outside it. 24. Effects of such aa 

 atmosphere on radiation. 25. Hypothesis of Sir J. Herschel. 26. 

 Intensity of heat at Sun's surface. 27. Supposed source of heat. 



1. AiTHorGH perhaps the moon is the object among the heavenly 

 bodies which presents the subject of most interesting inquiry to 

 the world in general, yet, to the thoughtful and contemplative 

 LARDNER'S MUSEUM OP SCIENCE. H 97 



No. 34. 



