Scope and Contents Letter to Sir Charles Lyell from Carlo Gemmellaro regarding his volcanic research on Mount Etna. Gemmellaro mentions his respect for the topographical works of Baron Waltershausen but states that the only fault he saw in Waltershausen during his stay in Sicily was the Baron's disregard for the learned Sicilian people. Discusses the geology of Aci Reale, in particular the strata of lava on which the village rests; Baron Waltershausen thought there were only 2 layers, Gemmellaro believes he...