++Incipe sic, si vis alique{ m} nu{ me}ru{ m} mediar{ e}: Sc{ ri}be figurar{ um} seriem sola{ m}, velut an{ te}.
[Sidenote: The four things to be known in mediation: the first the second; the third; the fourth. Begin thus.]
¶ In þis Chapter is ta[gh]t þe Craft of mediaciou[n~], in þe quych craft þ{ o}u most know 4 thynges. ffurst what is mediacio[n~]. the secunde how mony rewes of figur{ es} þ{ o}u most haue in þe wyrchyng{ e} of þis craft. þe thryde how mony diu{ er}se cases may happ in þis craft.[{ 8}] [[the .4. what is þe p{ ro}fet of þis craft.]] ¶ As for þe furst, þ{ o}u schalt vndurstonde þat mediacio[n~] is a takyng out of halfe a nomber out of a holle nomber, [*leaf 149a] as yf þ{ o}u wolde take 3 out of 6. ¶ As for þe secunde, þ{ o}u schalt know þ{ a}t þ{ o}u most haue on{ e} rewe of figures, & no moo, as þ{ o}u hayst in þe craft of duplacio[n~]. ¶ As for the thryd, þou most vnd{ er}stonde þat 5 cases may happe in þis craft. ¶ As for þe fourte, þou schall{ e} know þat the p{ ro}fet of þis craft is when þ{ o}u hast take away þe haluendel of a nomb{ re} to telle qwat þer{ e} schall{ e} leue. ¶ Incipe sic, &c. The sentence of þis verse is þis. yf þ{ o}u wold medye, þat is to say, take halfe out of þe holle, or halfe out of halfe, þou most begynne þ{ us}. Write on{ e} rewe of figur{ es} of what nombre þou wolte, as þ{ o}u dyddyst be-for{ e} in þe Craft of duplacio[n~]. v{ er}sus.
¶ Postea p{ ro}cedas medians, si p{ ri}ma figura Si par aut i{ m}par videas.
[Sidenote: See if the number is even or odd.]
¶ Her{ e} he says, when þ{ o}u hast write a rewe of figures, þ{ o}u schalt take hede wheþ{ er} þe first figur{ e} be eue[n~] or odde in nombre, & vnd{ er}stonde þ{ a}t he spekes of þe first figure in þe ry[gh]t side. And i{ n} the ryght side þ{ o}u schall{ e} begynne in þis Craft.
¶ Quia si fu{ er}it par, Dimidiab{ is} eam, scribe{ n}s quicq{ ui}d remanebit:
[Sidenote: If it is even, halve it, and write the answer in its place.]
¶ Her{ e} is the first case of þis craft, þe quych is þis, yf þe first figur{ e} be euen. þou schal take away fro þe figur{ e} euen halfe, & do away þat fig{ ur}e and set þ{ ere} þat leues ou{ er}, as þus, 4. take [*leaf 149b] halfe out of 4, & þan þ{ ere} leues 2. do away 4 & sett þ{ ere} 2. þis is lyght y-now[gh]t. v{ er}sus.