VIEW OF NAPLES AND VESUVIUS. 



EARTHQUAKES AND VOLCANOES. 



CHAPTEE II. 



34. Earthquakes at Jamaica. 35. Extent of the Lisbon earthquake. 

 36. Long continuance of slight earthquakes. 37. They affect all 

 kinds of strata. 38. They sometimes pass over certain districts 

 called bridges. 39. Inferior strata are sometimes agitated when the 

 superficial strata are undisturbed. 40. Inferior strata sometimes 

 undisturbed when superficial strata are agitated. 41. Undulations 

 often, but not always, move parallel to mountain chains. 42. Hum- 

 boldt's description of the effects of earthquakes. 43. Number of 

 earthquake -shocks in England. 44. Ejection of matter from the 

 interior of the earth. 45. Temperature of water in Artesian wells. 

 46. Temperature indicates depth. 47. Natural thermal springs. 

 48. Independent of strata. 49. Their occasional permanency the 

 classic fountains still flow. 50. From certain depths vapour only 



LARDNER'S MUSEUM OP SCIENCE. M 161 



Xo. 46. 



