Aristotle, Augustine, and Boethius each in their own way discuss signification as a triadic relation, with the soul or concepts in between signs and things. The 13th-century Franciscan Roger Bacon diverges sharply from this older view, arguing instead that signs refer directly to things. Bacon, who with Albert the Great was the first European to lecture publicly on the major works of Aristotle, is said to have initiated the study of Greek and Arabic optics (perspectiva) in the Latin-speaking world. The 1978 discovery of a manuscript of his lost work De Signis (On Signs) has raised scholarly awareness of his semiotics.
Boulnois has previously mentioned that Bacon treats concepts as a kind of sign. Here he contrasts Augustine and Aristotle with Bacon.
“Augustine thinks signification as a triadic relation between a thing, the sensible species perceived by the senses; another, the signified; and an interpreter, the mediating thought…. From the outset, Augustine distinguishes ‘natural’ signs from ‘given’ signs (data). Natural signs do not involve a voluntary production, but correspond to a natural causality: footprints recall the passage of an animal that produced them, smoke the fire that caused it. But the ‘given’ signs presuppose the intentional activity of a living being” (L’Être et représentation, p. 18, my translation throughout).
I like the idea that there is always need for interpretation.
The idea of natural signs is fascinating. These would have to be distinct from the sensible and intelligible “species” whose existence and role were debated by medieval authors. Whereas species are a kind of images or likenesses of things, smoke is not an image of fire, and tracks are not the image of an animal. The natural signs are each interpretable as effects of a particular kind, that point to a particular kind of natural cause. This implies the existence of a natural causality that is real in the sense of being in the things and not imposed by us, even if its particulars require interpretation.
Meanwhile, “given” signs do reflect a sort of imposition, even if the imposition is not the act of an individual. In contrast with the natural signs, they are said to be voluntary. The main example seems to be the words and expressions of a language. Relative to an individual, they are pre-given; but relative to a historical community, they mean what the community in fact takes them to mean.
“Augustine articulates this theory of the sign to that of language and intellection, notably with the idea of the verbum cordis [word of the heart], mental language, interior word, thought fixed on a word, definitional image of the thing in thought: ‘Even without sounding words, the one who thinks speaks in his heart’ ” (p. 19).
On this view, thought is understood as a kind of speaking in one’s heart. Subjective meanings attributable to speakers of spoken language are to be explained in terms of a “mental language” that is different from, but analogous to, any particular spoken language. This is different from the view that speaking in one’s heart is enabled by an interiorization of spoken language, without the need to posit a separate mental language.
Boulnois contrasts Augustine’s view with Aristotle’s “semiotics of inference”.
“But a completely different definition of the sign, of Aristotelian origin, interferes with this…. Here the sign is a proposition, the point of departure for reasoning by inference, such that it founds a demonstration…. The sign is the antecedent of a conditional proposition or of an inference” (ibid). “The sign, which in Augustine grounds a relation between two things, in Aristotle founds induction between two propositions” (p. 20).
Neither of these is equivalent to the simple view that signs stand for things directly, which is closer to what Bacon will defend. Boulnois is reading Augustine as saying that a sign is or grounds a real relation between two things, and Aristotle as saying it is or grounds a relation of implication between two assertions. But for both Aristotle and Augustine, the sign refers primarily to some kind of relation, rather than simply to a thing.
“Besides this semiotics of inference, Aristotle develops a complex semantics at the beginning of the treatise On Interpretation…. The symbolic relation is constitutive of language, but it can also be expressed in the vocabulary of the semeion [sign], of logical inference, which allows a passage from sensible expressions to concepts…. But by the intermediary of the concept, indirectly, signs refer to the thing” (pp. 20-21).
Aristotle and Augustine each develop their own kind of indirect or mediated or “moderate” realism.
“The Aristotelian definition of the sign as a principle of inference is reprised by Peter of Spain…. Whereas Augustine only envisages signs as presenting sensible species, Bacon wants to account for the intelligibles evoked by Aristotle — the concepts. But he makes them representing signs” (pp. 22-23).
Here Boulnois does connect signs with species in Augustine’s case, but their relation is still not one of identity. Many of Augustine’s medieval readers would likely have interpolated a notion of species (e.g., a sensible species of smoke, for smoke) into their understanding of Augustine’s account. In this way we might say that a sensible species of smoke is a sign of fire (“is” of predication, not “is” of identity). But smoke as a sign of fire is not the same as the sensible species of the smoke.
“This reorganization rests on the concept of representation, already used by Peter of Spain: when a sign represents, it constitutes a term in a proposition, and recalls many intentional objects (the signifieds), or it ‘supposes for’ them. With the concept of representation, expressing a theory of supposition (or of reference), Peter of Spain gives himself the means to unify the general relation between sign and signified (signification in Augustine), and the conventional relation between the vocal sound and the thing named. Avoiding here the mediation of the concept, he brings together under a single vocable the natural relation of the concept to the thing and the conventional relation of the vocal sound to the concept. In reprising this vocabulary, Bacon integrates in the same term of representation the relation of the sensible sign to the thing signified and of the concept to the thing known. He takes sides at the same time against Boethius, in posing that the signified of the concept is the thing itself and not an intermediary concept. Thus while Boethius ordered semantics by noetics, the theory of representation puts them on the same plane” (p. 23).
Direct realism was actually a radical innovation, as Boulnois points out.
“Bacon thus can unify all the relations, natural and conventional, between vocal sounds, intellections, and things, under the general concept of the sign. Even though he recognizes that Aristotle concentrates in the treatise On Interpretation on conventional signs, vocal sounds, it is necessary to produce a universal theory of signs, including intellections, vocal sounds, and writing” (pp. 23-24).
One abstract theory of signs and things signified is used to cover both natural and linguistic cases.
“Starting from this Baconian innovation, it will be necessary to examine the challenges of this response to the great semantic controversy over the sign. If the concept is a sign and if the sign represents the thing itself, in what way do the great semantic questions play out based on this fundamental decision? From this foyer can be explained the natural character of the concept, the convention of the linguistic sign, and the importance of an imposition inscribed in a juridical and political order” (p. 24).
From this standpoint, concepts are assimilated to natural signs, whereas linguistic signs are arbitrary and depend on convention. Concepts on this view are individually self-contained. They are what they are independent of any articulation by us. It remains that they must be naturally or supernaturally given to us. The implicit notion of any concept in Aristotle, on the other hand, depends not only on its form, but also more generally on what is (or would be) well said by us, which is to say on its articulation in language, which must be understood against a background of other articulations in language.
The Postmodern Peripatetic 