A sketch of Madeira : containing information for the traveller, or invalid visitor . rates, and lava. That there is a general identity in the source of all volcanicaction no one can doubt who observes the uniformity of vol-canic products, under similar conditions, in all parts of theworld. It may be presumed, perhaps, that the correspond-ence and contemporaneousness of earthquakes in distantvolcanic foci are due to this cause. One of the statements ofsuch a correspondence in Madeira is that the undulationfrom the Lisbon earthquake in 175,5 reached this island soon 136 GEOLOGY. [chap. vi. after
A sketch of Madeira : containing information for the traveller, or invalid visitor . rates, and lava. That there is a general identity in the source of all volcanicaction no one can doubt who observes the uniformity of vol-canic products, under similar conditions, in all parts of theworld. It may be presumed, perhaps, that the correspond-ence and contemporaneousness of earthquakes in distantvolcanic foci are due to this cause. One of the statements ofsuch a correspondence in Madeira is that the undulationfrom the Lisbon earthquake in 175,5 reached this island soon 136 GEOLOGY. [chap. vi. after it visited Portugal. It may be questioned, however,whether we have here an instance of the rapidity of undula-tions, or rather of the simultaneous exertion of volcanicforces, proportionally affecting at the same moment certainweak points of the surface of the earth. Countries raisedby volcanic action so late as the tertiary period appear tobe still more subject than others to earthquakes, and Madeirais not an exception to this rule. APPENDIX. LIST OF PLANTS, BIEDS, ETC. From a Sketch by Lady Susan Vernon Harcourt. English Burial Ground. See pa APPENDIX. SIR HANS SLOANES LIST OF PLANTS. The following list of some of the plants of Madeira iscurious, as being one of the earliest notices of the botany ofthe island. It was drawn up by Sir Hans Sloane during hisAdsit to Madeira in 1687 *. In an inner margin of the pageare given the Linnsean names, which I found in some mar-ginal pencil notes to an old edition of Sir Hans Sloanesworks in the library of West Dean House, Sussex: theyare evidently the work of no mean botanist. To these afew corrections are added in brackets, by the Rev. , from whose scientific skill and intimate acquaintancewith the Flora and Sylva of the island a more accurate ac-count of its botanical products may hereafter be looked for. Oleastre species ut quiclam put ant, ut alii Zizyplms hort. 269. Olea Sylvestris folio molli
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