X.
Xanthus, the Lydian, his theory, 14.
Y.
Yak, wild ox of Thibet, frozen in ice, 85.
Yakutzt, frozen soil of, 84.
Yaou, flood of, 7.
Yarmouth, estuary silted up at, 307. ----, rise of the tide at, 291, 307.
Yenesei, R., fossils on banks of, 79.
Yorkshire, bones of mammoth in, 76. ----, waste of its coasts, 303.
Young, Dr., on effects of compression at earth's centre, 536.
Z.
Zante, earthquakes in island of, 474.
Zealand, New, number of ferns, 116. ----, resemblance of plants with ancient carboniferous flora, 116. ----, length and breadth of, 116.
Zeuglodon, eocene cetacea, 145.
Zoological provinces how formed, 666. ----, why not more blended together, 668.
Zoophytes, their geographical distribution, 651. ----, their powers of diffusion, 654. ----, abundance of, 706. ----, which form coral reefs, 776.
Zuyder Zee, formation, 328. ----, great mosses on the site of, 327.
* * * * *
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