Throughout this evolution from left to right, Beard always detested war. Hence his writings were slanted to show that the military side of history was insignificant or a mere reflection of economic forces. ↗
The well-known fact that the form of a specific substance, e.g. water, and hence its properties can alter without a change in composition was disposed of by the formal view that a physical, not a chemical, process was involved. ↗
It is that of increasing knowledge of empirical fact, intimately combined with changing interpretations of this body of fact - hence changing general statements about it - and, not least, a changing a structure of the theoretical system. ↗