CONTENTS. xv 



TABLE I 1 AGE 



106. Velocity of the Tide in Water of different Depths . . 84 



107. Course of the Tide to the English Coasts 84 



108. Establishments of Ports . 85 



109. Latitude and Longitude of Towns 80 



110. Distances and Areas 011 the Surface of the Globe . . 87 



111. Distances and Areas on Maps 88 



112. Dimensions of the Earth 88 



113. Density of the Earth 89 



114. The Moon 90 



115. The Calendar 90 



116. The Solar System 91 



117. Squares of Radii of Gyration 94 



118. Surface Tensions 95 



119. Elastic Constants of Quartz 96 



79. Rough Data in Electricity 96 



120. Table of Logarithms 100 



