Muhammad Ali Khalidi

The notion of 'natural kinds' has been central to contemporary discussions of metaphysics and philosophy of science. Although explicitly articulated by nineteenth-century philosophers like Mill, Whewell and Venn, it has a much older history dating back to Plato and Aristotle. In recent years, essentialism has been the dominant account of natural kinds among philosophers, but the essentialist view has encountered resistance, especially among naturalist metaphysicians and philosophers of science. Informed by detailed examination of classification in the natural and social sciences, this book argues against essentialism and for a naturalist account of natural kinds. By looking at case studies drawn from diverse scientific disciplines, from fluid mechanics to virology and polymer science to psychiatry, the author argues that natural kinds are nodes in causal networks. On the basis of this account, he maintains that there can be natural kinds in the social sciences as well as the natural sciences.

There is a widespread assumption in cognitive science that there is anintrinsic link between the phenomena of innateness and domain specificity. Many authors seem to hold that given the properties of these two phenomena, it follows that innate mental states are domain-specific, or that domain-specific states are innate. My aim in this paper is to argue that there are no convincing grounds for asserting either claim. After introducing the notions of innateness and domain specificity, I consider some possible arguments for the conclusion that innate cognitive states are domain-specific, or vice versa. Having shown that these arguments do not succeed, I attempt to explicate what I take to be the connection between innateness and domain specificity. I argue that it is simply easier to determine whether and to what extent domain-specific cognitive capacities are innate. That is,the relation between innateness and domain specificity is evidential or epistemic, rather than intrinsic.

This essay will explore some of al-Farabi’s paradoxical remarks on the nature and status of the democratic city (al-madinah al-jama'iyyah). In describing this type of non-virtuous city, Farabi departs significantly from Plato, according the democratic city a superior standing and casting it in a more positive light. Even though at one point Farabi follows Plato in considering the timocratic city to be the best of the imperfect cities, at another point he implies that the democratic city occupies this position. Since Farabi’s discussion of imperfect cities is derived from Plato’s Republic and follows it in many important respects, I will argue that his departure from Plato in this context is significant and points to some revealing differences between the two philosophers. In order to demonstrate this, I will first set up a comparison between Plato’s conception of the democratic city and Farabi’s. Then I will propose three explanations for the greater appreciation that Farabi seems to have for democracy, as well as for the apparent contradiction in Farabi’s verdict concerning the second best city.

Griffiths and Machery (2008) have argued that innateness is a folk notion that obstructs inquiry and has no place in contemporary science. They support their view by criticizing the canalization account of innateness (Ariew, 1999, 2006). In response, I argue that the criticisms they raise for the canalization account can be avoided by another recent account of innateness, the triggering account, which provides an analysis of the concept as it applies to cognitive capacities (Khalidi, 2002, 2007; Stich, 1975). I also claim that they have not demonstrated that the folk notion of innateness is unsuitable for rehabilitation in a science of cognition. I conclude that they have not made the case that the notion of innateness ought to be eliminated from a scientific account of the mind

Some philosophers and historians of science have suggested that the meanings of scientific terms change in the course of the history of science in such a way that the comparison of successive theories becomes impossible. This claim of "incommensurability", usually associated with Thomas Kuhn and Paul Feyerabend, has attracted attention for its relativist and anti-rationalist implications. It would seem to make the choice between two theories into a random affair, not one of direct comparison. ;The principal attempts to defeat this claim are based either on Saul Kripke and Hilary Putnam's causal theory of reference, first proposed as an account of the reference of proper names, or on Donald Davidson's general argument that all languages are inter-translatable. However, the former is inappropriate as a reply to incommensurability and the latter must be modified before it can serve as a procedure for theory-comparison. After looking at these two replies in detail, the dissertation proposes a method for comparing theories. ;Davidson's argument against incommensurability is adapted so that his interpretive method can serve as the basis of a procedure for comparing scientific theories. Certain constraints on interpretation are spelt out in order to arrive at a unique way of isolating the agreements and disagreements among theories. The main attraction of the interpretive approach is that it consists of a descriptional account of meaning which is also holistic. That is to say, it identifies a term from one theory with a term from another on the basis of the overlap between the two theories, but without relying on the analytic-synthetic distinction. ;A number of case studies are used to demonstrate how theories can be compared and their concepts matched up. One of the consequences of this approach is that transitivity in the translation of concepts will generally break down. But that does not force an anti-realist position in the philosophy of science. To justify this claim, a discussion of scientific taxonomy is undertaken and criticisms are made of the essentialist conception of natural kinds

Scientific essentialism holds that: (1) each scientific kind is associated with the same set of properties in every possible world; and (2) every individual member of a scientific kind belongs to that kind in every possible world in which it exists. Recently, Ellis (Scientific essentialism, 2001 ; The philosophy of nature 2002 ) has provided the most sustained defense of scientific essentialism, though he does not clearly distinguish these two claims. In this paper, I argue that both claims face a number of formidable difficulties. The necessities of scientific essentialism are not adequately distinguished from semantic necessities, they have not been shown to be necessities in the strictest sense, they must be relativized to context, and they must either be confined to a subset of scientific properties without warrant or their connection to causal powers must be revoked. Moreover, upon closer examination (1) turns out to be a trivial thesis that can be satisfied by non-kinds, and (2) is inapplicable to some of the most fundamental kinds in the basic sciences.

Could some social kinds be natural kinds? In this paper, I argue that there are three kinds of social kinds: 1) social kinds whose existence does not depend on human beings having any beliefs or other propositional attitudes towards them ; 2) social kinds whose existence depends in part on specific attitudes that human beings have towards them, though attitudes need not be manifested towards their particular instances ; 3) social kinds whose existence and that of their instances depend in part on specific attitudes that human beings have towards them . Although all three kinds of social kinds are mind-dependent, this does not make them ontologically subjective or preclude them from being natural kinds. Rather, what prevents the third kind of social kinds from being natural kinds is that their properties are conventionally rather than causally linked

Naturalism about natural kinds is the view that they are none other than the kinds discoverable by science. This thesis is in tension with what is perhaps the dominant contemporary view of natural kinds: essentialism. According to essentialism, natural kinds constitute a small subset of our scientific categories, namely those definable in terms of intrinsic, microphysical properties, which are possessed necessarily rather than contingently by their bearers. Though essentialism may appear compatible with naturalism, and is indeed sometimes qualified with the epithet “scientific,” it has become increasingly clear in recent years that only a minority of categories posited by science satisfy those conditions. I will not try to argue against essentialism directly in this chapter. Instead, I will attempt to articulate an alternative, naturalist conception of natural kinds, according to which the mark of natural kinds is their discoverability by science, not just basic science but the special sciences and even the social sciences.

Philosophers and historians of science have made the claim that successive scientific theories are incommensurable, that is, that many or all of their concepts fail to coincide. This claim has been echoed by cognitive psychologists who have applied it to the successive conceptual schemes of young children, or of children and adults. This paper examines the psychological evidence for the claim and proposes ways of reinterpreting it which do not involve imputing incommensurability. An alternative approach to understanding conceptual change is suggested, according to which novel concepts are introduced against a background of shared concepts, rather than as part of incommensurable conceptual schemes.

Among philosophers working on modality, there is a common assumption that there is a strong connection between temporal possibility and counterfactual possibility. For example, Sydney Shoemaker 1998, 69 70) writes: It seems to me a general feature of our thought about possibility that how we think that something could have differed from how it in fact is [is] closely related to how we think that the way something is at one time could differ from the way that same thing is at a different time. In possible worlds jargon, the ways one and the same thing of a given sort can differ across worlds correspond to the ways one and the same thing of that sort can differ at different times in the same world. Could I have been a plumber or an accountant instead of a philosopher? The answer seems to be yes -- and this goes with the fact that we acknowledge the possibility of a scenario in which someone who was exactly as I was at some point in my life undergoes a series of changes resulting in his eventually being a plumber or an accountant. In a footnote, he acknowledges that this connection between counterfactual and temporal possibility needs to be qualified in response to an objection by Randy Clarke: «The property of being the child of someone who has visited Paris is not one that one can have and then lose; but it is one that one can have in the actual world and not have in some other possible world.» (1998, 75n.9) Therefore, he restricts the inference from temporal to counterfactual possibility and vice versa to «non historical properties.»

Philosophy in the Islamic world emerged in the ninth century and continued to flourish into the fourteenth century. It was strongly influenced by Greek thought, but Islamic philosophers also developed an original philosophical culture of their own, which had a considerable impact on the subsequent course of Western philosophy. This volume offers new translations of philosophical writings by Farabi, Ibn Sina, Ghazali, Ibn Tufayl, and Ibn Rushd. All of the texts presented here were very influential and invite comparison with later works in the Western tradition. They focus on metaphysics and epistemology but also contribute to broader debates concerning the conception of God, the nature of religion, the place of humanity in the universe, and the limits of human reason. A historical and philosophical introduction sets the writings in context and traces their preoccupations and their achievement.

Functional reductionism concerning mental properties has recently been advocated by Jaegwon Kim in order to solve the problem of the 'causal exclusion' of the mental. Adopting a reductionist strategy first proposed by David Lewis, he regards psychological properties as being 'higher-order' properties functionally defined over 'lower-order' properties, which are causally efficacious. Though functional reductionism is compatible with the multiple realizability of psychological properties, it is blocked if psychological properties are subdivided or crosscut by neurophysiological properties. I argue that there is recent evidence from cognitive neuroscience that shows that this is the case for the psychological property of fear. Though this may suggest that some psychological properties should be revised in order to conform to those of neurophysiology, the history of science demonstrates that this is not always the outcome, particularly with properties that play an important role in our folk theories and are central to human concerns.

In this paper I offer a unified causal account of natural kinds. Using as a starting point the widely held view that natural kind terms or predicates are projectible, I argue that the ontological bases of their projectibility are the causal properties and relations associated with the natural kinds themselves. Natural kinds are not just concatenations of properties but ordered hierarchies of properties, whose instances are related to one another as causes and effects in recurrent causal processes. The resulting account of natural kinds as clusters of core causal properties that give rise to clusters of derivative properties enables us to distinguish genuine natural kinds from non-natural kinds. For instance, it enables us to say why some of the purely conventional categories derived from the social domain do not correspond to natural kinds, though other social categories may.

This paper examines the phenomenon of ‘interactive kinds’ first identified by Ian Hacking. An interactive kind is one that is created or significantly modified once a concept of it has been formulated and acted upon in certain ways. Interactive kinds may also ‘loop back’ to influence our concepts and classifications. According to Hacking, interactive kinds are found exclusively in the human domain. After providing a general account of interactive kinds and outlining their philosophical significance, I argue that they are not confined to the human realm, but that they can also occur elsewhere. Hence, I conclude by arguing that interactive kinds pose a challenge to scientific realism about kinds by making it difficult to make a distinction between real and non-real kinds.

This paper discusses a philosophical issue in taxonomy. At least one philosopher has suggested thc taxonomic principle that scientific kinds are disjoint. An opposing position is dcfcndcd here by marshalling examples of nondisjoint categories which belong to different, cocxisting classification schcmcs. This dcnial of thc disjoinmcss principle can bc recast as thc claim that scientific classification is "int<-:rcst—rclativc". But why would anyone have held that scientific categories arc disjoint in the first place'? It is argued that this assumption is nccdcd in one attempt t0 dcrivc csscntialism. This shows why the csscntialist and intc-:rcst—r<-zlativc approaches to classification arc in conflict.