Under the guidance of its first director, Emile Waxweiler, SIS expressed a "conception of a sociology open to all of the disciplines of the human sciences: ethnology, of course, but also economics [...] and psycho-physiology, contact with which was facilitated by the proximity of the Institute of Physiology" (Vatin 1996: 486).
In addition, in 1897, Solvay gave to "the School of Political and Social Sciences annexed to the Université [Libre] de Bruxelles, a sum sufficient to assure its existence over three years" (Rey 1903: 196).
The ambitious course of research which SIS had embarked upon under Waxweiler's guidance may readily be summarized by the rubrics under which his Archives Sociologiques arrayed and reviewed new works contributing either to the progress of human sociology or to its introduction (cited in Sch.
1912: 37): In addition, thanks to Solvay's largesse, Waxweiler's expansive vision, and its implantation in an architectural space of its own, SIS — utilizing modern methodologies from its very beginning — was never enthralled by any particular school of thought, such as that cast by Durkheim on the bulk of Francophone sociology, and functioned as "a true 'laboratory,' conducting in-depth inquiries, often involving statistical instrumentation, on the conditions of urban life, labor organisation, economic development, or even the ethnography of the Belgian Congo" (Vatin 1996: 486).
Following its incorporation into the Université Libre de Bruxelles, the directors of the Institute of Sociology have been eight in number: Ernest Mahaim (1923–1935), Georges Smets (1935–1952), Henri Janne (1952–1959), Arthur Doucy (1959–1980), Nicole Delruelle-Vosswinkel (1980–1989), Jacques Nagels (1989–1998), Alain Eraly (1998–2003), and currently, since 2003, Firouzeh Nahavandi (IS 2007).
Unfortunately, it is not so, and from the start M. Solvay would formulate a deductive sociological method, analogous to that of mathematical physics, or of chemical mechanics, and still without analogue in the field of biology, unless it be in the singular concepions of the author (Rey 1903: 196).
By February 1906, the following works had been published in this series (Solvay 1902/1906: frontispiece): In January 1910, Waxweiler, as editor the institute's Bulletin Mensuel [Monthly Bulletin] (Anonymous 1911: 552), began overseeing reviews of the works he was acquiring for the institute's Archives sociologiques [Sociological Archives], which had been started in order "to apply the new sociological point of view introduced by him [in Waxweiler 1906] to as many topics as possible, in order to test it, to fix a new orientation, and also to render the new way of thinking more subtle and fruitful" (Sarton 1917: 168).