Among the most excellent products of Egypt the climate must be counted.
The sources of the Nile are much farther south than where Bruce discovered them.
The eye-sight of the Hottentots is so well developed that they can hear the tramp of a horse at an incredible distance.
The walls of Babylon were so broad that four waggons could go on top of each other.
North America consists of a great number of large and small islands, very few of which are surrounded by water.
When Humboldt ascended Mount Chimborazo he found the air so thin that he could not read without glasses.
There is so much coal-smoke in London that even when the sun does not shine you cannot see the sky.
There would be far less leather produced by the English if they tanned only their own hides.
There are many propositions in mathematics that can only be proved by beginning over again.
The theory of parallel lines explains itself, for it tends toward infinity.