Fragments for a medieval theory of prosthesis
Katie L. Walter
Medieval surgery adumbrates a theory of the body in which flesh, because it is sanguine, is radically different from the other simple members that make up the body, such as skin, which are understood instead to be spermatic. In contrast with spermatic members, sanguine flesh is renewable, and so is held to be able to stand in the place of lost, diseased or injured spermatic parts. Surgical theory and practice utilises and artificially enhances this natural capacity of flesh to supplement and substitute in its remedies to repair the body, in what is broadly termed âincarnatyfâ medicine in Middle English. This essay suggests that this âincarnatyfâ tradition is part of a missing history of prosthesis, which in turn grounds forms of medieval prosthetic thought in two Middle English examples: the miracle of Cosmas and Damian, in which a living manâs rotten leg is replaced with the healthy leg of a dead man; and a series of connected revelations in Bridget of Swedenâs Liber Celestis, in which incorporation into the body of Christ is effected through Christâs own practice of surgical prosthesis. Raising questions about the relationship between self and other, life and death, and the human and divine, the medieval âincarnatyfâ imaginary also asks questions about the possibilities and limits of prosthesis as a metaphor for community and for the body of Christ itself.
In Surgery Prosthesis is taken for that which fills up what is wanting, as is to be seen in fistulous and hollow Ulcers, filled up with Flesh by that Art: Also the making of artificial Legs and Arms, when the natural ones are lost. (Phillipsâs New World of Words, 1706)1
In between its sixteenth-century appearance in English as a grammatical term and its later use to mean âthe making of artificial Legs and Armsâ lies another meaning of prosthesis. As Phillipsâs New World of Words describes, in surgery prosthesis is âthat which fills up what is wanting [âŠ] with Fleshâ. Phillipsâs 1706 dictionary definition is offered by the OED as early evidence of the use of prosthesis to mean âthe replacement of defective or absent parts of the body by artificial substitutesâ, but in Philipsâs definition this sense (at least syntactically) is itself an apposition, arising out of or adding to its primary sense as an art of making flesh. The prosthesis of the flesh is persistently absent from contemporary critical and philosophical engagements, and yet it is one with a long history reaching back (at least) to Galen and extending up through ParĂ©.
In the medieval period, the surgical art of making flesh is termed, not prosthesis, but âincarnatyfâ medicine.2 In this tradition flesh emerges as a natural prosthesis in the body, filling in gaps as well as substituting for other parts of the body, especially skin. As a fifteenth-century Middle English translation of Lanfrankâs surgical treatise (âScience of Cirurgieâ) records, the kinds of flesh in the body are threefold: further to the âglandelose [glandular]â flesh (in the breasts or testicles, for example) and the âbrawny [muscular]â flesh, is âsymple fleischâ whose âhelpinge is to fulfille ĂŸe voide placis of smale lymes to brynge hem [them] to a good schapâ.3 It is this capacity to fill up hollow, empty spaces in the body that particularises the role of flesh. Albertus Magnusâs De animalibus thus similarly records how flesh âfills up the gaps between the uniform and instrumental members and flows in and out of them and heals their injuriesâ (âquae su[p]plet vacua membrorum similium et instrumentalium, et haec influit et effluit et abrasa recrescit [lit. âregrows what has been scraped away (or, destroyed)â]â).4 The Latin verb used by Albertus to describe the function of flesh in the body is suppleo, âto fill up, make full or wholeâ or âto completeâ, which forms the root of the noun supplementum, or in Modern English supplement (OED, s. v. âto make good a deficiency; an addition or continuationâ). It is this natural capacity for flesh to supplement that surgical theory utilises and artificially enhances in its treatment of the wounds or diseases that disrupt the continuity of the body.
Understanding flesh, or making flesh, as a form of prosthesis suggests the originally âsupplemental or technical character of the bodyâ as modern philosophies of prosthesis also do, but it reframes its terms â away from language and rhetoric, and away from technical and technological prosthetics5 â to questions of the matter of the body itself.6 This essay is thus a kind of prolegomena for a missing history of flesh as prosthesis, a history which the medieval period in part supplies. It begins by establishing medieval understandings â inherited from classical and Arabic traditions and mediated in part by the medieval scholastics â of flesh and of âincarnatyfâ medicine in Middle English surgical treatises, in which flesh emerges as radically different from the body and thus as capable of supplementing, or substituting for, its parts. Two examples show the currency of âincarnatyfâ medicine outside of the surgical tradition. The first is a miracle of Cosmas and Damian. The miracle the saints perform takes up surgical theory, but extends its prosthetic logic beyond generating new flesh to substitute for missing parts within the body to exchanging flesh and parts between bodies. The second is a series of visions in the Liber Celestis, a Middle English translation of Bridget of Swedenâs Revelations (prepared partly as evidence for her canonisation), where Christ himself is a practitioner of âincarnatyfâ medicine, fashioning those who are his friends into his own prosthetic arm. These fragments for a history of flesh as prosthesis raise questions about what belongs to the body, to the individual, to the human; about the relationship of self and other, of life and death, and of the living and the dead, but also, in a highly medieval way, of the human and the divine. So too do they ask questions about both the possibilities and the limits of prosthesis â as supplement, or substitute, or as implant â particularly as a metaphor for community and for the body of Christ himself. Together these fragments suggest that flesh â archetypally â functions in the way the supplement does for Jacques Derrida:
the supplement supplements. It only adds to replace. It intervenes or insinuates itself in-the-place-of; if it fills, it is as if one fills a void. If it represents [âŠ] it is by the anterior default of a presence. Compensatory and vicarious, the supplement is an adjunct, a subaltern instance which takes-(the)-place.7
Derridaâs characterisation of the supplement offers a productive way of thinking about prosthesis in the three fragments I consider here: flesh as prosthesis not only vicariously fills the void, but it also performs the work of that which it replaces.
Flesh as prosthesis
In medieval taxonomies of the body, flesh and fat are radically different from the rest of the simple members (bones, nerves, skin, etc.) that make up the body. In the Galenic tradition, mediated by Arabic surgeons and followed by surgeons in the medieval west, flesh is categorised as sanguine in contradistinction with other simple members that are, instead, spermatic.8 This difference is crucial for medieval beliefs about both the continuity and survival of the body. As a Middle English translation of Guy de Chauliacâs Cyrurgie records: âsome membres beĂŸ [are] spermatik, for ĂŸei haue her [their] springynge of ĂŸe sparme [sperm], to ĂŸe whiche is noĂŸer [neither] generacioun [regeneration] ne verray [nor true] consolaciounâ.9 Lanfrankâs treatise similarly elaborates that spermatic members such as âboonis [bones], pelliculis [membranes], gristlis [cartilage], ligamentis & skynâ, because they are derived from âĂŸe sperme of ĂŸe fadir [father] & of ĂŸe modir [mother]â, cannot be restored once cut into or cut off (at least, not in their original form). In contrast, flesh can be newly made in the body from blood: âfleisch mai be restorid bi cause ĂŸat ĂŸe blood is engendrid al day in usâ.10 It is the natural properties of flesh that enable the body once injured or wasted through sickness to be repaired or healed.11 It is thus fleshâs very (subaltern) difference from spermatic members that enables it to act as a substitute for them.
This prosthetic role of flesh in the body is central to the medieval craft of surgery and its teaching on how âto ioyne ĂŸat is departedâ12 through a process that might broadly be termed âincarnaciounâ or âincarnatyfâ medicine in Middle English, and âprosthesisâ in Phillipsâs 1706 English dictionary.13 This process of making new flesh â also variously referred to as âfleshyngeâ and âgendryngeâ â is one both natural to and artificially produced in the body through the use of bindings (âbyndynge incarnatyf (i. to make flesche)â), stitches (âsewyng incarnatyf (i. makynge flesche)â), and âincarnatyfâ medicines.14 Recalling Avicennaâs teaching on the irreplaceable nature of spermatic members, Lanfrank instructs that in cases of a hollow ulcer where âschal neuere [shall never] be no skyn engendrid ĂŸeronâ, medicines should be used âto engendre hard fleisch aboue [vt nascatur caro calosa dura], & schal be in ĂŸe place of skyn [que est loc...