Classification and Chemical Revolution

All of the compounds of metal oxides listed in field IV/c are by implication compounds of oxygen. However, in the phlogistic chemical system, metal oxides were regarded as (relatively) simple substances and not as oxides. Moreover, even with respect to the anti-phlogistic Tableau, one can argue that field IV/c represents the taxonomic unit of compounds of different metal calces rather than that of compounds that have oxygen as their common component. 

What does this strikingly simple switch from the old taxonomic system to the new revolutionary one mean According to Thomas Kuhn, comparing taxonomic structures yields the yardstick for judgments about scientific revolutions. He proposed to regard two theories as commensurable if 

The question is then, is the possibility of generating a phlogistic mirror classification by just shifting two couples of classes of the Tableau indicative of the commensura-bility of the two chemical systems or, on the contrary, of their incommensurability  

We argue that this possibility constitutes commensurability rather than incommensurability the kinds of the one system are directly translatable into the kinds of the other. This holds not only for phlogiston, which was translatable into the oxygen and 

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