In existographies, Georgij Alekseev (c.1938-) (CR:3) refers to 
In 1978, Alekseev, in his Energy and Entropy, gives a quaint, fun to read, overview of physics up through the early days of thermodynamics.
A “thermogen”, coined by Ezekiel Walker (1814), according to Alekseev, meaning ‘to bring forth heat’, was a hypothetical type of imponderable matter of fire, acting such that forces of repulsion occurred between the particles of thermogen, and forces of attraction occurred between thermogen and those of bodies.
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The following are quotes by Alekseev:
- “Historians consider Steven’s Elements of Equilibrium (1585) to have contributed significantly to the establishment of classical mechanics, but at that time the public was not very much aware of this treatise because he neglected toe obligatory Latin language and wrote the book in Dutch. Stevin came to the idea, independent of da Vinci, of the absolute impossibility of perpetual motion. Moreover, he not only suggested a theory but also applied it to practical problems of statics.”
- — Georgij Alekseev (1978), Energy and Entropy (pg. 63) 
- “Entropy is the name of the queen’s shadow. Face to face with this phenomenon, man cannot help feeling some vague fear: Entropy, like an evil spirit, tries to diminish or annihilate the best creations of that gracious spirit, energy. We are all under the protection of energy and all potential victims of the latent poison of entropy.”
- — Georgij Alekseev (1978), Energy and Entropy (pg. #); a requote or paraphrase of an early 20th century popular science writer; cited by: Roberto Luzzi (2004) in “Entropy: Myster and Controversy”
- Alekseev, Georgij Nikolaevic – WorldCat Identities.