CHAPTER IX 



GEOLOGY 



I. Vulcanicity and Earth-movements. — II. Ice-action. — III. T/ie 

 Parallel Roads of Gloi Roy. — IV '. Coral Reefs, Fossil 

 and Recent. — V. Cleavage and Foliation. — VI. A 

 the World. — VII. Geological Action of Earthworms. — 

 VIII. Miscellanea >us. 



I. Vulcanicity and Earth-movements, 1840-81. Letter 

 To David Milne. 1 



12, Upper Gower Street, Thursday [March] 20th [1S40]. 



I much regret that I am unable to give you any informa- 

 tion of the kind you desire. You must have misunderstood 

 Mr. Lyell concerning the object of my paper.- It is an 

 account of the shock of February, 1835, in Chile, which is 

 particularly interesting, as it ties most closely together 

 volcanic eruptions and continental elevations. In that paper 

 I notice a very remarkable coincidence in volcanic eruptions 

 in S. America at very distant places. I have also drawn up 

 some short tables showing, as it appears to me, that there 

 are periods of unusually great volcanic activity affecting large 



1 David .Milne-Hume (1805-90) was a country gentleman in Berwick- 

 shire who became interested in geology at an early age. He wrote on 

 the Midlothian Coal-field, the Geology of Roxburghshire, the Parallel 

 Roads of Glen Roy, and compiled the Reports presented byaCommitti 

 appointed by the Royal Society of Edinburgh to in. e the observa- 



tion and registration of boulders in Scotland [Quart, fount, c. . 5 

 Vol. XLVIL, 1891 ; Proc, p. 59). 



3 "On the Connexion of certain Volcanic Phenomena, and on the 

 Formation of Mountain-chains and the Effects of Continental Elevations." 

 Trans. Geol. Soc, Vol. Y., 1S40. pp. 601-3: [March 7th, 1838]. 



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