4. Everywhere one recognizes the presence of man by his works. The existence of the pre-diluvium man is proved not only by human fossils, but also, with as much certitude, by the presence in the soil of this epoch, of utensils made by man. A fragment of a vase, a carved stone, a weapon, a brick, will suffice to attest their presence. By the rudeness or by the perfection of the work one will recognize the degree of intelligence or of advancement of those who have accomplished it. If, then, finding yourself in a country inhabited exclusively by barbarians or savages, you should discover a statue worth of Phidias, you would not hesitate to say, that, savages being incapable of having made it, it must be the work of an intelligence superior to theirs.