%0 Journal Article %T Genera and species vs. laws of nature two epistemic frameworks and their respective ideal worlds. %A Balaban O %J Stud Hist Philos Sci %V 81 %N 0 %D Jun 2020 %M 32568710 %F 1.379 %R 10.1016/j.shpsa.2020.01.007 %X This paper seeks to exhibit and explain, by way of comparison, two ideal kinds of knowledge: knowledge based on classifications according to genera and species, as in Aristotelianism and common sense, and scientific knowledge based on the application of laws of nature. I will proceed by attempting (1) to determine the role that presuppositions play in knowledge in general by means of the distinction between content and form; (2) to describe and explain the main features of both ideal forms of knowledge; and, finally, (3) to analyze the relation between these two forms of knowledge as it is presented in Eddington's celebrated discussion of the "two tables". I will be critical of the widespread view that modern science is the correct form of knowledge, and that common sense is merely an illusion.