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Show ANNOTATIONS AND ADDITIONS. 291 by the first founder of the cathedral, Ludwig the Pious; and an original document of the 11th century says, "that when Bishop Hezilo rebuilt the cathedral which had been burnt down, he enclosed the roots of the rose-tree with a vault which still exists, raised upon this vault the crypt, which was re-consecrated in 1061, and spread out the branches of the rose-tree upon the walls." The stem now living is 26! feet high and about two inches thick, and the outspread branches cover about 32 feet of the external wall of the eastern crypt; it is doubtless of considerable antiquity, and well deserving of the celebrity which it has gained throughout Germany. If extraordinary development in point of size is to be regarded as a proof of long-continued organic life, particular attention is due to one of the thalassophytes of the sub-marine vegetable world, i. e. to the Fucus giganteus, or Macrocystis pyrifera of Agardh. According to Captain Cook and George Forster, this sea-plant attains a length of 360 English feet; surpassing, therefore, the height of the loftiest Coniferre, even that of the Sequoia gigantea, Endl., or Taxodium sempervirens, Hook and Arnott, which grows in California. (Darwin, Journal of Researches into Natural History, 1845, p. 239; and Captain Fitz-Roy in the Narrative of the Voyages of the Adventure and Beagle, vol. ii. p. 363.) Macrocystis pyrifera is found from 64° south to 45° north latitude, as far as San Francisco on the northwest coast of America; and Joseph Hooker believes it to extend as far as Kamtschatka. In the Antarctic seas it is even seen floating among the pack-ice. (Joseph Hooker, Botany of the Antarctic Voyage under the command of Sir James Ross, 1844, pp. 1, 7, and 178; Camille Montagne, Botanique cryptogame du Voyage de la Bonite, 1846, p. 36.) The immense length to which the bands or ribands and the cords or lines of the cellular tissue of the Macrocystis attain, appears to be limited only by accidental injuries. (13 ) p. 236.-" Species of plu:enogamous plants al?·eady contained in herbariums." We must carefully distinguish between three different questions : How many species of plants are described in printed works? how many have been discovered, i.e. are contained in herbariums, though without being described? how many are probably existing on the |