Ancient Greek Medicine - Aristotle

Aristotle

Ancient Greek philosopher Aristotle was the most influential scholar of the living world from antiquity. Though his early natural philosophy work was speculative, Aristotle's later biological writings demonstrate great concern for empiricism, biological causation, and the diversity of life. Aristotle did not experiment, however, holding that items display their real natures in their own environments, rather than controlled artificial ones. While in physics and chemistry, this assumption has been found unhelpful, in zoology and ethology it has not, and Aristotle's work "retains real interest". He made countless observations of nature, especially the habits and attributes of plants and animals in the world around him, which he devoted considerable attention to categorizing. In all, Aristotle classified 540 animal species, and dissected at least 50.

Aristotle believed that intellectual purposes, formal causes, guided all natural processes. Such a teleological view gave Aristotle cause to justify his observed data as an expression of formal design; for example suggesting that Nature, giving no animal both horns and tusks, was staving off vanity, and generally giving creatures faculties only to such a degree as they are necessary. In a similar fashion, Aristotle believed that creatures were arranged in a graded scale of perfection rising from plants on up to man—the scala naturae or Great Chain of Being.

He held that the level of a creature's perfection was reflected in its form, but not foreordained by that form. Yet another aspect of his biology divided souls into three groups: a vegetative soul, responsible for reproduction and growth; a sensitive soul, responsible for mobility and sensation; and a rational soul, capable of thought and reflection. He attributed only the first to plants, the first two to animals, and all three to humans. Aristotle, in contrast to earlier philosophers, and like the Egyptians, placed the rational soul in the heart, rather than the brain. Notable is Aristotle's division of sensation and thought, which generally went against previous philosophers, with the exception of Alcmaeon. Aristotle's successor at the Lyceum, Theophrastus, wrote a series of books on botany—the History of Plants—which survived as the most important contribution of antiquity to botany, even into the Middle Ages. Many of Theophrastus' names survive into modern times, such as carpos for fruit, and pericarpion for seed vessel. Rather than focus on formal causes, as Aristotle did, Theophrastus suggested a mechanistic scheme, drawing analogies between natural and artificial processes, and relying on Aristotle's concept of the efficient cause. Theophrastus also recognized the role of sex in the reproduction of some higher plants, though this last discovery was lost in later ages. The biological/teleological ideas of Aristotle and Theophrastus, as well as their emphasis on a series of axioms rather than on empirical observation, cannot be easily separated from their consequent impact on Western medicine.