66. How the water is connected with the earth. Of the navigation of the sea and the rivers 97 67. Whether the ocean surrounds the earth 98 68. What part of the earth is inhabited 100 69. That the earth is in the middle of the world 102 70. Of the obliquity of the zones _ib._ 71. Of the inequality of climates _ib._ 72. In what places eclipses are invisible, and why this is the case 104 73. What regulates the daylight on the earth 105 74. Remarks on dials, as connected with this subject 106 75. When and where there are no shadows 107 76. Where this takes place twice in the year and where the shadows fall in opposite directions 108 77. Where the days are the longest and where the shortest _ib._ 78. Of the first dial 109 79. Of the mode in which the days are computed 110 80. Of the difference of nations as depending on the nature of the world _ib._ 81. Of earthquakes 111 82. Of clefts of the earth 112 83. Signs of an approaching earthquake 114 84. Preservatives against future earthquakes _ib._ 85. Prodigies of the earth which have occurred once only 115 86. Wonderful circumstances attending earthquakes 116 87. In what places the sea has receded _ib._ 88. The mode in which islands rise up 117 89. What islands have been formed, and at what periods 118 90. Lands which have been separated by the sea 119 91. Islands which have been united to the main land _ib._ 92. Lands which have been totally changed into seas _ib._ 93. Lands which have been swallowed up 120 94. Cities which have been absorbed by the sea _ib._ 95. Of vents in the earth 121 96. Of certain lands which are always shaking, and of floating islands 122 97. Places in which it never rains 123 98. The wonders of various countries collected together _ib._ 99. Concerning the cause of the flowing and ebbing of the sea 124 100. Where the tides rise and fall in an unusual manner 127 101. Wonders of the sea 128 102. The power of the moon over the land and the sea _ib._ 103. The power of the sun 129