This volume consists of thirteen short papers in English that were presented at the third Erlenmeyer Colloquium in Marburg (Germany) in September 1996. It contains a longish introduction in German by Peter Janich, giving a detailed and fair overview of the contents of the contributions and a useful discussion of the various ways the question of the autonomy of chemistry can be taken. First and foremost the organisers should be complemented on their initiative – the first Erlenmeyer Colloquium was organised in 1993, before the philosophy of chemistry ‘took off’. The aim of these colloquia is to bring chemists and philosophers together, this time to discuss the autonomy of chemistry as a ‘Wozu-Frage’ (a what-for or a for-what-purpose question). While this is an extremely laudable goal, there are nonetheless some inherent problems involved in publishing the papers from such a gathering, most essentially because the editors have little control over the contents of contributions or which contributions will be published – I assume all papers are published here. Of the thirteen papers, there were only three I found really worthwhile from the perspective of the philosophy of chemistry. There are interesting comments in some of the other papers, but either they dive at once into the history of chemistry, present personal views, or aim to cram many years of research published elsewhere into ten pages.
There is an excellent paper by Nikos Psarros on the difference between physical, chemical, and biochemical molecules and on the question whether molecules are the bricks of the world. (Answer: Yes, if you need them to explain phenomena you have created in your laboratory. No, if you don’t.) Then there is a very well-researched paper by Joachim Schummer on the ‘situatedness’ of physical chemistry, and Theodore Arabatzis reviews the conflict between chemists and physicists about electrons in the time of C.N. Lewis, combining historical research with pertinent philosophical observations. The book is well worth its (modest) price for these three papers alone for anybody interested in the philosophy of chemistry.
Of the contributions that are least satisfactory the paper of Klaus Mainzer stands out. It reads like a glossary of his many publications on the subjects he reviews, moving all over the place; from ‘mathematical graph theory’ to GUT (i.e. ‘the big unification of electromagnetic, weak and strong forces’); from explaining what nucleic acids are to discussing DENDRAL and CAMD. He even finds space to remind the reader that "1 nm = 10-9 m = 10 Å" (p. 45). (I return to the substantial point of this paper below.) Pierre Laszlo says there is "a deep analogy between chemistry and linguistics, that can be elaborated quite far" (p. 76), but in his paper this intriguing suggestion is only very indirectly supported by long digressions, from children mixing paints to quotes of Baumé (1773) to support that chemistry was a combinatorial art from the beginning. Laszlo also says: "What sociologists may gain in objectivity, they lack in competence, being unable for instance to distinguish between a passing scientific fad (such as use of NMR shift reagents in the 1970s) and a genuine breakthrough (such as the discovery of fullerenes in 1987)." This is at the same level as when the physicist Herbert Dingle says: "The whole of chemistry may therefore, so far as final results go, be regarded as a superfluous study" . No need for this mud throwing to fuel local culture wars. Like Mainzer and Laszlo, Gerd Hanekamp has done interesting work in the philosophy of chemistry, but he spends most of his ten pages reviewing what, in general, methodological constructivism and culturalism is about. When he finally comes to chemistry there is room left only for a list of tantalising definitions and a couple of brief comments. Valeria Mosini reviews the pitfalls of the old question whether living organisms violate the second law of thermodynamics. From a philosophy of chemistry perspective one would have liked to have seen more on the notions of disorder and dissipated energy and what this means for the relation of thermodynamics and statistical mechanics, instead of historical digressions on Delbrück, vitalists, and Bohr.
In his introduction, Janich deftly brings all papers under the theme of the conference, viz. the autonomy of chemistry, and he concludes that there is a surprisingly broad consensus about a reduction-critical attitude. He says: "It is obvious that none of the contributions represents a form of reductionism, neither a crude, nor a subtle-careful one" (p. 29). But such a conclusion by-passes the hard philosophical issues. As Janich himself points out, one can distinguish between two foundational issues. Without putting weight on the use of these terms, I will call the first issue that of methodological (historical, genealogical) autonomy, and the second, ontological (metaphysical, closed system, natural laws) autonomy (corresponding to Janich’s "abschließende Form theoretischer Darstellung" and "Abhängigkeiten im Zugang zu einem Wissen" – also compare his useful list of different criteria for tackling the Wozu-Frage). At a higher level of abstraction I would oppose this dichotomy, but given this way of speaking, it serves a useful purpose in the following way. Janich is surely right to say that chemistry is and will remain autonomous in its development (relative to other natural sciences), and there is no clear-cut methodological hierarchy between chemistry and physics (pp. 29, 65). Nobody would expect it to be otherwise, given the long-standing and well-entrenched institutional separation of physics and chemistry, fuelled by the ‘imagined communities’ of identity formation, as well as the constant interactions between the two (amply illustrated in the contributions in the book under review). With historical examples (Faraday, Mayer and Liebig), Peter Buck nicely illustrates that, notwithstanding all interaction, physics and chemistry are different: physical comprehension just is (psychologically) different from chemical comprehension. However this observation has little bearing on discussions about the ontological autonomy of chemistry (Janich’s "abschließende Form theoretischer Darstellung"). The latter question is a much more tricky one, only addressed, and then only indirectly, in the contributions of Psarros, Schummer, and Hanekamp. The other contributions are either neutral or display a soft or crude reductionism (as this term is normally understood in the philosophy of science). For example, Gernot Frenking’s paper is entitled "Heretical thoughts of a theoretical chemist about the autonomy of chemistry as a science in the past and the present". But in this paper we find him saying (pp. 105-7):
 "The underlying laws necessary for the mathematical theory of a large part of physics and the whole of chemistry are thus completely known, and the difficulty is only that exact applications of these laws lead to equations which are too complicated to be soluble."
 I. Kant, Schriften, 4:470; cf. 4:471, 14:470, 29:173, 31:288, 31:316.
 Dingle, op. cit.