This thesis examines the micro-/macrocosm model in Archaic and Classical Greek thought. The main focus of the thesis centres on medical and philosophical theories and these are examined against the background of popular beliefs and mythology. The evidence investigated will be drawn from the Hippocratic and Aristotelian Corpus. The original formation of mankind is studied in relation to the idea that mankind is a product of the natural environment and so parallels the universe in its form and processes. Owing to this, the body reacts in the same way as the natural environment does to change and the overall nature of the natural environment extends to the nature of the body and its diseases. The fact that the body changes with the weather in this way meant that physicians could predict disease patterns through predicting the weather.