P. Thomsen, The Relation between Ancient Russia and Scandinavia and the Origin of the Russian State (London, 1877); the series of works by K.
Julius Thomsen was the first investigator who deliberately adopted the principle of the conservation of energy as the basis of a thermochemical system.
Somewhat later than Thomsen, Marcellin P. E.
Thomsen and Berthelot independently enunciated a generalization (commonly known as Berthelot's Third Principle, or Principle of Maximum Work), which may be stated in brief as follows: - Every pure chemical reaction is accompanied by evolution of heat.
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