"None of you would like to be compared to those animals who feed on grass, to the hog who wallows in the mire, nor to the dog, in whom man has found the qualities of both friend and companion; nor further, to the horse, though he were as celebrated as the famous Gladiator.
"Man is not an animal. He is distinguished above the brute creation by numerous and important attributes. We have only to consider his intellectual capacity, the power of articulation, which gives to every people a special language, the capacity to write, which reproduces language; the aid of the fine arts, to explain and materialize the conceptions of his imagination. He is also distinguished above animals by two fundamental characters which belong solely to him. Man is the only organized and living being who has the abstract sentiment of both good and evil, the only being in whom there exists a moral sense, the only one who believes in a future state, and who recognizes the existence of beings superior to himself, having influence upon him for good or evil. It is this two-fold conviction which grasps and holds the great truths which are called religion.
"At a later period I will return to these two questions of morality and religion, not as a theologian, but as a naturalist. At present I limit myself to this fact, that man, however savage he may be, shows signs of morality and religion that are not found in any animal. Consequently, man is a being apart, separated from animals by two great distinctions which are his own, and also by his incontestable superiority. There the difference ceases. With regard to his body, man is nothing more or less than an animal. Apart from some differences of form and disposition, he is no more than equal to the superior animals that surround us. If we take for comparison those that assimilate to our general form, anatomy shows us that our organs are the same as theirs; we find in them muscle for muscle, nerve for nerve, that is found in man himself. Physiology, in turn, has demonstrated that, in the body of man, the organs, the muscles, the nerves, have the same animal functions.
"This fact is indisputable, taken from a purely scientific and practical view. We cannot experiment upon man, but it is possible to do so upon animals. Human physiology employs the means to enlighten us upon our organic functions. Physicians have carried to the sick-bed the result of their investigations upon animal life. Anthropology also, we shall see, has derived useful lessons from beings who are essentially our inferiors. Anthropology should descend still lower than animals to enlighten us thoroughly. Vegetables are not animals any more than animals are men; but man, animals, and vegetables are linked together in the same living organization. By this only, they are distinguished from the minerals, which are neither the one nor the other, and by certain general facts known to all.
"All organized beings have a limited duration, all are created small and weak, all grow and become strong; during a part of their existence, all decrease in energy and vitality, sometimes also in size, then die. During life, all organized beings have need of nourishment. Before dying, all produce, either by a seed or by an egg, (I speak of species, not individuals,) which is true of the species that seem to come directly from a shoot, a layer, or a graft; all proceed from a grain, or an egg. Thus, all these great phenomena, common to all living organized beings, including man as well as plants, suppose a general law for their government. Science confirms this conclusion every day, which is not an invention of reasoning alone, but is regarded as an experienced fact. Further explanations are not necessary to show the magnificent result.
"How admirable, that man and the smallest insect, that the lord of the soil and the smallest plant, are attached one to the other, by the same links, and that the entire living creation forms together a perfect harmony!
"In this communion, and in certain phenomena of this accordance with certain laws, equally common, there results one consequence upon which I would not too strongly insist. Whatever may be the questions relating to man, that we have to examine whenever these touch upon any one of the phenomena that are common to all living organized beings, we must not only investigate animal life, but also vegetable life, if we would wish to find the truth.
"When one of these questions is proposed, what can we truthfully urge in reply? We must examine man under the general laws that govern other living organized beings. If the investigation tends to make man an exception to these general laws, we shall know it is false. If you resolve the problem so as to include man in the general laws, you may be sure that you are scientific and correct. With these proofs, and these only, I proceed to the second question of anthropologists. Are there several species of men, or does there exist but one, comprising several races?