Taken together, Locke, his cabinet, and the library it contained provide the ecology in which Locke’s remarks about the cabinet-like structure of the mind are immediately embedded. The network provides a way of speaking: the understanding with its ideas is like a curator in a cabinet. A second problem emerges, however, which Locke’s shelving system was not designed to handle. This is the problem of recollection—and it is his solution to this problem that cuts to the core of Locke’s metaphorical theory of metaphors. As Locke puts it, a man who seeks but is unable to find “those ideas that should serve his turn, is not much more happy in his knowledge than one that is perfectly ignorant.”51 For the “business … of the memory,” Locke remarks, is not merely to store up impressions but “to furnish to the mind those dormant ideas which it has present occasion for.”52 This problem for the active and goal-oriented mind, the one embedded in what he calls a “present occasion,” or, colloquially, a man’s “turn,” demands a system in which ideas are linked to the subject at hand. It requires, therefore, a related but distinct technology, for the ordering of knowledge as though it were a collection of things will involve more than the ability to store ideas in a stable, organized place. It also demands the organization and collation of ideas so that they can be integrated into present circumstances. What is wanted is a system where a context—a “present occasion”—might already suggest a shifting and adaptable constellation of related ideas or concepts, which nevertheless point back to the material and exemplary ground from which they emerged.
The creation of links between present occasion and ideas of use, Locke insists, is partly a power that memory already has. Among the natural work of memory is the retention of associations between ideas, as those ideas are patterned by experience. This is an old idea, that turns up, among other places, in the Summa of Thomas Aquinas, who is in turn indebted to Aristotle’s De Memoria.53 The mind of itself creates groupings among ideas of things it witnesses together. But the development of such associations is also a capacity that can be mastered and perfected, and it is in the working out of this problem in the library that Locke put a traditional form to new use. He was the inventor of a new system of collating and storing extracts, a system that was destined to become, in part for the fame of its author, the most popular method for note taking until the end of the eighteenth century.54 This is Locke’s New Method of Common-placing. Locke’s copy of Hyde’s Catalogus was geared toward the regular filing away of the matter of knowledge, but his series of notebooks laid out by the New Method worked that knowledge up into patterns and systems for their instant, motivated use. It provided therefore a second set of metaphors, overlaid upon the first, which helps explain how things witnessed in the world are liquidated into the materials of thinking.55
Like the library, the commonplace was an old technology when Locke encountered it. It emerged through Renaissance humanist practice, developed out of theories of poetics as they were understood to have been conceived by Cicero and Quintilian (see Exhibit 2).56 The book of commonplaces (topos koinos in Aristotle’s Greek or locus communis in Cicero’s Latin commentary) provided the backbone to the Scholastic brand of philosophical inquiry and the classical style of rhetorical disputation alike.57 Cicero, especially as he was received in Locke’s England, understood the development of oratory to hinge on what he called “inventio.” This category meant to include more than merely the discovery (invention in its etymological sense) of a happy order or the spontaneous development of an effective turn of phrase; it expanded over the Renaissance to include the gathering, storage, and recollection of examples with an eye to their use in narrative or argument.58 All of this counted as “inventio.” The commonplace, as Locke encountered it, was a heuristic device dedicated to the kind of rhetorical making that inventio demanded;59 the “declared purpose of … the serious commonplace book,” as it has recently been put, was “action,” specifically for “the better arming one’s arguments in speech or writing.” It was organized to store examples according to arguments already well known.60 The humanist commonplace was based on inherited categories; largely because it was geared toward disputation in traditional questions of ethics and theology, the Renaissance commonplace began as a sort of grid of traditional topics, and it located examples to fit.61 Many of these commonplaces, indeed, were printed volumes already filled in, minor encyclopedias with prepared entries and suitable for a wide range of cultural work; numerous early modern and premodern writers—Montaigne, Shakespeare, even Milton62—have been shown to have relied on such prepared commonplaces. Culling examples from a wide array of sources, traditional commonplaces were harnessed to a recognizable polemic end, gathering examples and rhetorical resting places as the mirror of a Renaissance cosmos, assembling in small the proof of the divine order of the world. They offered a relatively standardized way of dividing up the realms of knowledge.63 As Ann Blair puts it, “Explananda … become ‘commonplaces’ in the technical as well as the colloquial sense: in being selected from their original source and entered into the commonplace book [extracts] become self-evident truths.”64
Locke’s innovation was to convert the commonplace into a machine for developing abstract categories themselves.65 He thereby turned a form dedicated to the repetition of the Renaissance worldview into a tool for the new philosophy and its inductive methods—or, in other words, “abstraction” as a natural process of intellection.66 Locke at most titled commonplace volumes according to inherited categories—physica, theologica, medica—but his indices, where the real organizational work of recollection was prepared, were organized according to the present state of his learning, his interests, how he had already learned to understand the world, and, in general, what he observed as he read. The system begins with Locke reading; when he comes across a passage that seems important to him, he considers (in the words of an eighteenth-century editor) “to what head the thing [he] would enter is most naturally referred; and under which, [he] would be led to look for such a thing.”67 Armed with a single word (“Epistle” is Locke’s apt example), Locke consults his index. Here, heads will be gathered according to their first letter and following vowel, so it is necessary to begin by seeing if there are other Epistolary notes already entered. Had there already been an entry in “Ei,” Locke would have found the page number in the index, and turned to that page. Finding “Ei” empty, however, he turns to the first blank page in the book and copies out the passage verbatim. When he is finished copying, he inserts the head in the margin, and turns back to the index, where he writes the number of the page in the commonplace book under “Ei.” Some of Locke’s many imitators developed ways of reintroducing categories back into the index itself; one user, for instance, inserted heads in superscript in the index: “Go—13Gold coin, 21Gold Mine,” and so on.68 Locke simply wrote these categories in the margins of each page, whereby, in his words, “the Heads present themselves at First Sight.”69 It is worth pausing to make the point explicitly. Locke’s index was by no means the only technology whereby mental models were realized in curatorial practices—and curatorial practices in the vocabularies of intellection. But between Locke’s space of work and his theory of the intellect we may witness a cognitive ecology at work, where the logics of abstraction are distributed between keeper and collection.
More than one of Locke’s contemporaries instantly recognized the metaphorical work of his commonplacing system; John LeClerc for instance begins his celebration of Locke’s commonplacing system with the advantages it has