Emile Zola sets Therese Raquin as a canvas to illustrate a naturalistic novel where he pushes forward the idea of a scientifically correct extension of practicality in order to call his novel a “study of temperament, not character”, (Zola 4). Zola’s self image as an analyst to the action positions him to focus on properties of naturalism as he dictates the narrative following specific hereditary and situational factors that intertwine amongst characters to dictate their respective fates. ( Zola couples temperaments to portray the effect they have on an individual’s behaviour and in doing so emphasises the element of naturalism as an aspect of scientific realism exemplified by primitive human behaviour. Zola specifically displays the primordial instincts of humans using characters with strong animalistic desires who in his portrayal are victims of hereditary and situational factors. This is shown by the interactions between Thérèse and Laurent, Camille and Mme. Raquin, and Camille and Thérèse. Zola’s belief on human corruption and instinctual desires of revenge, sex and greed focus his examination on reality and human nature. Zola’s analyst approach fortifies his psychological assessment of character in accordance with specific hereditary and situational factors.