Belgian chemist, industrialist, and philanthropist (1838–1922). Solvay, who created the famous ‘Solvay conferences’ where Einstein, Marie Curie, Bohr, Heisenberg, Born, Paule, Broglie and other physics luminaries would meet and exchange discoveries. Rare ALS in French, signed “E. Solvay,” two pages on two adjoining sheets, 4.75 x 7.25, personal letterhead, January 24, 1910. Solvay thanks his correspondent (the editor of a scientific review) for his support. Translated in full: “I am very touched by the kind attention you have expressed to me and the fact that you have approved the movement of pure and applied sociology that I try to lead and the type of competition I think I can put in place. Of course, I accept, the reasons you gave for not being able to include the article, even though with some regrets, as your explanations are precise. I like to hope that in the ‘bibliography’ of your Review, you can mention my research, the main result I have in mind: Worldwide fundamental elements of the research can still be achieved, the letter I sent you and the text of the research, plus the two articles I wrote which you published in your Review will easily provide material for a good summary. If necessary, my staff here could help you.” In fine condition. RR Auction COA.