Nurse, it was I who discovered that leeches have red blood.[]On his deathbed when the nurse came to apply leeches

Secondly, the nature of the revolutions which have altered the surface of the earth must have had a more decisive effect on the terrestrial quadrupeds than on the marine animals.

Why has not anyone seen that fossils alone gave birth to a theory about the formation of the earth, that without them, no one would have ever dreamed that there were successive epochs in the formation of the globe.

My object will be, first, to show by what connections the history of the fossil bones of land animals is linked to the theory of the earth and why they have a particular importance in this respect.

The observer listens to nature: the experimenter questions and forces her to reveal herself.

The lowest and most level land areas show us, especially when we dig there to very great depths, nothing but horizontal layers of material more or less varied, which almost all contain innumerable products of the sea.

Hence the same instant which killed the animals froze the country where they lived. This event was sudden, instantaneous, without any gradual development.