Three, on the geography of plants.

Three, on the geography of animals, and Two, on the races of men.

These lectures are what is known as the Cosmos, and present a scientific picture of the world—of infinite diversity in unity—of ceaseless motion in the eternal grasp of law.

These lectures contain the result of his investigation, observation, and experience; they furnish the connection between phenomena; they disclose some of the changes through which the earth has passed in the countless ages; the history of vegetation, animals and men, the effects of climate upon individuals and nations, the relation we sustain to other worlds, and demonstrate that all phenomena, whether insignificant or grand, exist in accordance with inexorable law.

There are some truths, however, that we never should forget: Superstition has always been the relentless enemy of science; faith has been a hater of demonstration; hypocrisy has been sincere only in its dread of truth, and all religions are inconsistent with mental freedom.

Since the murder of Hypatia in the fifth century, when the polished blade of Greek philosophy was broken by the club of ignorant Catholicism, until to-day, superstition has detested every effort of reason.

It is almost impossible to conceive of the completeness of the victory that the church achieved over philosophy. For ages science was utterly ignored; thought was a poor slave; an ignorant priest was master of the world; faith put out the eyes of the soul; the reason was a trembling coward; the imagination was set on fire of hell; every human feeling was sought to be suppressed; love was considered infinitely sinful; pleasure was the road to eternal fire, and God was supposed to be happy only when his children were miserable. The world was governed by an Almighty's whim; prayers could change the order of things, halt the grand procession of nature, could produce rain, avert pestilence, famine and death in all its forms. There was no idea of the certain all depended upon divine pleasure—or displeasure rather; heaven was full of inconsistent malevolence, and earth of ignorance. Everything was done to appease the divine wrath; every public calamity was caused by the sins of the people; by a failure to pay tithes, or for having, even in secret, felt a disrespect for a priest. To the poor multitude, the earth was a kind of enchanted forest, full of demons ready to devour, and theological serpents lurking with infinite power to fascinate and torture the unhappy and impotent soul. 'Life to them was a dim and mysterious labyrinth, in which they wandered weary, and lost, guided by priests as bewildered as themselves, without knowing that at every step the Ariadne of reason offered them the long lost clue.

The very heavens were full of death; the lightning was regarded as the glittering vengeance of God, and the earth was thick with snares for the unwary feet of man. The soul was supposed to be crowded with the wild beasts of desire; the heart to be totally corrupt, prompting only to crime; virtues were regarded as deadly sins in disguise; there was a continual warfare being waged between the Deity and the Devil, for the possession of every soul; the latter generally being considered victorious. The flood, the tornado, the volcano, were all evidences of the displeasure of heaven, and the sinfulness of man. The blight that withered, the frost that blackened, the earthquake that devoured, were the messengers of the Creator.

The world was governed by Fear.

Against all the evils of nature, there was known only the defense of prayer, of fasting, of credulity, and devotion. Man in his helplessness endeavored to soften the heart of God. The faces of the multitude were blanched with fear, and wet with tears; they were the prey of hypocrites, kings and priests.