The term 'Subject for Aristotle' refers to two of the main topics of his philosophical work: LOGIC and ETHICS. LOGIC, which is also known as formal or syllogistic LOGIC, was a system of reasoning that Aristotle developed in order to understand the world around him. ETHICS, on the other hand, was a branch of philosophy that focused on moral principles and values. Both of these topics were important to Aristotle and he wrote extensively about them.