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| Keywords: The Quarterly journal of the Geological Society of London (12981082605).jpg 544 <br> PKOCEEDINGS OF THE GEOLOGICAL SOCIETY <br> Feb 2 <br> to give no credit to the well-attested frequent and great changes <br> of form in the cone and crater of that mountain many even <br> within memory of man and to which I have already referred <br> changes the earlier of which are admirably delineated and de- <br> scribed in the great work of Sir William Hamilton who himself <br> witnessed many of them between 1768 and 1800 during which long <br> period of thirty-two years he resided at Naples and continually <br> watched the volcano see figs 22 and 23 Coming to a later period <br> the upheavalists do not seem to be aware that for some years previous <br> to 1822 Yesuvius had no crater at all but showed on its truncated <br> summit a rough platform upon which several parasitic cones were <br> occasionally thrown up and subsequently destroyed by minor erup- <br> tions while streams of lava flowed from them almost continually <br> down the slope of the cone and hardened there They do not seem <br> at all aware that the explosions of 1822 blew off the summit of the <br> cone with aU its excrescences lowering its absolute height by some <br> 600 or 800 feet and replacing the solid platform by a crater a mile <br> in diameter and a thousand feet deep which vast cavity was Tvithin <br> a very few years filled again by subsequent eruptions from the <br> bottom and has been again nearly emptied and re -filled in a similar <br> manner more than once f See fig 24 In the face of these well- <br> known facts we have M de Humboldt endorsing the strange dictum <br> of de Buch that Yesuvius has not changed at all in height or <br> Fig 24 Ideal Section of Vesuvius and Somma before and after the <br> eruption of 1822 <br> The fainter lines represent the portion removed by the eruption <br> bulk since the year 79 of our era ; and gravely attributing recorded <br> differences in its height either to incorrect measurements only or <br> internal elevation en masse that is renewed upheaval of the entire <br> cone i <br> It is singular that the geologists of the last century Hamilton <br> Breislak and Spallanzani should have held views respecting the <br> action of volcanos so much more accordant with the truth than <br> Reducing it from 4200 feet to 3400 feet above the sea Forbes <br> t See mj paper on Craters c Proc of Greol Soc vol xiv p 335 <br> - - -- Kosmos iv p 346 <br> I Humboldt Tableaux de la Nature Paris 1829 36162111 111474 51125 Page 544 Text v 15 http //www biodiversitylibrary org/page/36162111 1859 Geological Society of London NameFound Vesuvius NameFound Yesuvius Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 15 1859 Geology Periodicals Smithsonian Libraries bhl page 36162111 dc identifier http //biodiversitylibrary org/page/36162111 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-07 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12981082605 2015-08-26 14 55 01 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1859 Photos uploaded from Flickr by FĂŚ using a script | ||||
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