Dhanvantari was the physician of the gods and he taught Sushruta the art of ayurveda (medicine). The Agni Purana now describes what the sage Ssushruta had learnt, that is, the treatment for various diseases. This does not simply mean the treatment of human illnesses. There is a section known as vriksha ayurveda, which describes what trees are to be planted where. It describes how a garden is to be constructed and maintained.
The chapters on medicine also describe the treatment of elephants, horses and cattle. The mantras (incantations) which are the remedy for snake poison are also related.