A Treatise of Human Nature taste to be in the other), arguing that unextended perceptions must somehow exist without having a location. But the contrary problem arises for dualists: how can extended perceptions (of extended objects) possibly be conjoined to a simple substance? Indeed, Hume waggishly adds, this is basically the same problem that theologians commonly press against Spinoza's naturalistic metaphysics: thus if the theologians manage to solve the problem of extended perceptions belonging to a simple substance, then they give "that famous atheist" Spinoza a solution to the problem of extended objects as modes of a simple substance. Finally, Hume examines "causal relations", arguing
Mass fraction (chemistry) Mass fraction (chemistry) In chemistry, the mass fraction formula_1 is the ratio of one substance with mass formula_2 to the mass of the total mixture formula_3, defined as The symbol formula_5 is also used to denote mass fraction. The sum of all the mass fractions is equal to 1: Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (in commercial contexts often called "percentage by weight", abbreviated "wt%"; see mass versus weight). It is one way of expressing the composition of a mixture in a dimensionless size; mole fraction (percentage by moles, mol%) and