journey with Ehrenberg and Gustavus Rose, who published the result of their mineralogical and geological survey, in a work of which he is the sole author; while Humboldt published under the title of "Asiatic Fragments of Geology and Climatology," his observations of the physical and geographical features made during that journey. But he had hardly returned to Berlin when in consequence of the revolution of 1830, he was sent by the King of Prussia as extraordinary ambassador to France, to honor the elevation of Louis Philippe to the throne. Humboldt had long been a personal friend of the Orleans family, and he was selected ambassador on that occasion on account of these personal relations. From 1830 to 1848 he lived alternately in Berlin and in Paris, spending nearly half the time in Paris and half the time in Berlin, with occasional visits to England and Denmark; publishing the results of his investigations in Asia, making original investigations upon various things and especially pressing the establishment of observatories, and connected magnetic observations all over the globe, for which he obtained the co-operation of the Russian government and that of the government of England; and at that time those observations in Australia and in the Russian empire to the borders of China, were established which have led to such important results in our knowledge of terrestrial magnetism. Since 1848 he has lived uninterruptedly in Berlin, where he published on the anniversary of his eightieth year a new edition of those charming first flowers of his pen; his "Views of Nature," the first edition of which was published in Germany in 1808. This third edition appeared with a series of new and remodelled annotations and explanations; and that book in which he first presented his views of nature, in which he drew those vivid pictures of the physiognomy of plants and of their geographical distribution is now revived and brought to the present state of science.