Five, upon the nature and limits of physical geography.
Three, were devoted to a history of science.
Two, to inducements to a study of natural science.
Sixteen, on the heavens.
Five, on the form, density, latent heat, and magnetic power of the earth, and to the polar light.
Four, were on the nature of the crust of the earth, on hot springs earthquakes, and volcanoes.
Two, on mountains and the type of their formation.
Two, on the form of the earth's surface, on the connection of continents, and the elevation of soil over ravines.
Three, on the sea as a globular fluid surrounding the earth.
Ten, on the atmosphere as an elastic fluid surrounding the earth, and on the distribution of heat One, on the geographic distribution of organized matter in general.