Through my research on Clausius these past 30 years,I could achieve a better understanding of the relation between Rudolf Clausius and Hantaro Nagaoka. In one of my previous papers on Nagaoka's Saturnian atomic model in 1972, I referred to Clausius's Virial, applied for the molecules from the Saturnian atomic models in 1905. I studied Nagaoka's atomic model and its development and published a number of papers between 1965-74, together with his biography. Then I have published a number of articles and a book on the mechanical theory of heart in the 19th century. At the coming Congress,I will discuss the background of the above relation together with Nagaoka 's approach.