Novum Organum

The Novum Organum, fully Novum Organum, sive Indicia Vera de Interpretatione Naturae ("New organon, or true directions concerning the interpretation of nature") or Instaurationis Magnae, Pars II ("Part II of The Great Instauration"), is a philosophical work by Francis Bacon, written in Latin and published in 1620. The title is a reference to Aristotle's work Organon, which was his treatise on logic and syllogism. In Novum Organum, Bacon details a new system of logic he believes to be superior to the old ways of syllogism. This is now known as the Baconian method.

For Bacon, finding the essence of a thing was a simple process of reduction, and the use of inductive reasoning. In finding the cause of a 'phenomenal nature' such as heat, one must list all of the situations where heat is found. Then another list should be drawn up, listing situations that are similar to those of the first list except for the lack of heat. A third table lists situations where heat can vary. The 'form nature', or cause, of heat must be that which is common to all instances in the first table, is lacking from all instances of the second table and varies by degree in instances of the third table.

The title page of Novum Organum depicts a galleon passing between the mythical Pillars of Hercules that stand either side of the Strait of Gibraltar, marking the exit from the well-charted waters of the Mediterranean into the Atlantic Ocean. The Pillars, as the boundary of the Mediterranean, have been smashed through by Iberian sailors, opening a new world for exploration. Bacon hopes that empirical investigation will, similarly, smash the old scientific ideas and lead to greater understanding of the world and heavens. This title page was liberally copied from Andrés García de Céspedes's Regimiento de Navegación, published in 1606.

The Latin tag across the bottom – Multi pertransibunt & augebitur scientia – is taken from the Old Testament (Daniel 12:4). It means: "Many will travel and knowledge will be increased".

Bacon's work was instrumental in the historical development of the scientific method. His technique bears a resemblance to the modern formulation of the scientific method in the sense that it is centered on experimental research. Bacon's emphasis on the use of artificial experiments to provide additional observances of a phenomenon is one reason that he is often considered "the Father of the Experimental Philosophy" (for example famously by Voltaire). On the other hand, so-called modern scientific method, which is a pluralistic hodge-podge, obviously does not follow Bacon's methods in its details, but more in the spirit of billing itself as "methodical and experimental," and so his position in this regard can be disputed. Importantly though, Bacon set the scene for science to develop various methodologies and ideologies, because he made the case against older Aristotelian approaches to science, arguing that method was needed because of the natural biases and weaknesses of the human mind, including the natural bias it has to seek metaphysical explanations which are not based on real observations.

Bacon begins the work with a rejection of pure a priori deduction as a means of discovering truth in natural philosophy. Of his philosophy, he states:

Now my plan is as easy to describe as it is difficult to effect. For it is to establish degrees of certainty, take care of the sense by a kind of reduction, but to reject for the most part the work of the mind that follows upon sense; in fact I mean to open up and lay down a new and certain pathway from the perceptions of the senses themselves to the mind.

The emphasis on beginning with observation pervades the entire work. In fact, it is in the idea that natural philosophy must begin with the senses that we find the revolutionary part of Bacon's philosophy, and its consequent philosophical method, eliminative induction, is one of Bacon's most lasting contributions to science and philosophy.