From this Bacon suggests that the underlying cause of the phenomenon, what he calls the "form", can be approximated by interpreting the results of one's observations. This approximation Bacon calls the "First Vintage". It is not a final conclusion about the formal cause of the phenomenon but merely a hypothesis. It is only the first stage in the attempt to find the form and it must be scrutinised and compared to other hypotheses. In this manner, the truth of natural philosophy is approached "by gradual degrees", as stated in his "Novum Organum".