 Interdependence and hybridity. In general, the higher-level theories (for instance, cell physiology) and the lower-level theories (for instance, biochemistry) are ontologically and epistemologically inter-dependent on matters of informational content and evidential relevance; one cannot be developed without the other (Kincaid 1996; Kincaid 1997; Wimsatt 1976; Spector 1977). The interaction between fields (through researchers’ judgments and borrowings) may provide enabling conditions for subsequent interactions. For instance, Maxwell’s adoption of statistical techniques in color research enabled the introduction of similar ideas from social statistics in his research in reductive molecular theories of gases; the reduction, in turn, enabled experimental evidence from chemistry and acoustics; similarly different chemical and spectroscopic bases for colors provided chemical evidence in color research (Cat 2013 and 2014).