Oxford, Bodleian Library, Auct. F. 1. 9.

Century	12 med.
Place of origin	England
Language	Latin
Subject 1	Arithmetic \| Astronomy
Owner’s notes	"William Riggs" owned the book in s. 16.
Material	Membr.
Height × width	15 x 10 3/4 in.
No. of leaves	ii + 184
No. of columns	2 cols.
Initials etc.	With coloured capitals.
Exlibris	An early s. 15 parchment label of contents is now on IIv; the hand resembling that of similar labels on covers of \| F. Madan & H.H.E. Craster, A summary catalogue of western manuscripts in the Bodleian Library at Oxford II 1 (1922) # 1966, 2747 & 2749, all Worcester priory books.
Printed catalogs	F. Madan, H.H.E. Craster & N. Denholm-Young, A summary catalogue of western manuscripts in the Bodleian Library at Oxford II 2 (1937) 861-3 # 4137.
Source	Folkerts \| Madan et al. (1937)
Type of source	cat. \| pvt. notes
Source’s source	insp.

Work 1	Title (ms.)	Calendarial, arithmetical, and astronomical pieces, among which are:
Work 2	Title (ms.)	Rithmomachie
	Contents	A short piece on the game of numbers.
	Incipit	Quinque nam (altered to ge(nerea)) inequalitatis regulam (regulariter) ex equalitate procedere manifestum est
	Folio no.	1- \| 1-2v
	Rubric	Rithmimachia
	Prolog	With preface; it states the author to be a clerk of Würzburg ("quidam ex clero Guirtiburgensis")
	Explicit	CCCLXI. ad .CXC. superno impartiens.
	T & K	TK 1248
	Additional information	G.R. Evans, The Rithmomachia: a medieval mathematical teaching aid ?, Janus 63 (1976) 260.
Work 3	Author standard	Garlandus
	Scribe(s)	At 18 the hand changes.
	Title (ms.)	Compotus
	Contents	The division of books is not otherwise marked; the second book begins at 20.
	Incipit	Superioris igitur pagine
	Folio no.	12v-
	Initial lines	Preceded by a list of chapters in bk. 1.
	Rubric	Compotus Garlandi Bedam imitantis
	Prolog	Sepe uolumina domni Bede
	Tables	With tables.
	Additional copies	Bk. 2 is given in a shorter version than in GOxfB Digby 56.
Work 4	Title (ms.)	A treatise on fractions and divisions
	Incipit	Cognitis unciarum minutiarumque nominibus \| Cognitis unciarum minutiarumque nominibus figuris et quantitatis
	Folio no.	27- \| 27-33v
	Rubric	(without title)
	Tables	A table (before the text).
Work 5	Title (ms.)	Qui numeri digiti vel articuli dicuntur
	Incipit	Qui numeri digiti vel articuli dicuntur
	Folio no.	33v-41v
Work 6	Title (ms.)	A treatise on the abacus (in 2 bks.)
	Contents	Bk. 1 deals with multiplication, bk. 2 (55) with division. Gerbertus, i.e. pope Sylvester II, is quoted on 44v, 53.
	Incipit	Quod ratione abaci et subtili studio probandae et opere sint exercendae \| Rationes numerationis abaci et subtiliter interna mentis acie sunt examinande
	Folio no.	41v- \| 41v-65v
	Illustrations	With coloured diagrams.
	T & K	TK 1316
	Additional information	M. Destombes, Archives international d'Histoire des Sciences 15 (1962) 39.
Work 7	Author (ms.)	Bernhelmus (ed.)
	Author standard	Bernelinus
	Additional names	Amylius
	Title (ms.)	Liber Abacus (3 bks.)
	Contents	Before the text are certain rules of division and multiplication, beg. "Singularis quiusque diuisor denominationem secundabit", cp. 73. (66v) Bk. 1, (68) bk. 2, (70v) bk. 3.
	Incipit	Abaci tabula undique prius polita
	Additional remarks	The fourth book is missing.
	Folio no.	66- \| 66-75
	Rubric	Incipit prefatio libri Abaci quem Iunior Bernhelmus (Bernelinus) edidit Parisius
	Dedication	Domino suo Amylio Bernhelmus suus ... Mirari pater sancte non desino exactionis tue instantiam
	T & K	TK 8 (Abaci ...) & 465 (Domino ...)
	Additional information	M. Destombes, Archives international d'Histoire des Sciences 15 (1962) 39.
Work 8	Author standard	Gerbert
	Title (ms.)	Liber de astrolabio
	Contents	Gerbert's account of the seven climata mundi comes in at 81. Then comes (81) what is perhaps a distinct treatise on the astrolabe, beg. "Quicunque desiderat scire certas horas noctium & dierum".
	Incipit	Quicunque astronomice peritiam
	Additional remarks	Here without title or author's name.
	Folio no.	75-
	Additional texts	At 79 "incipit de horologio secundum Alchoram id est speram rotundam", or rules for the use of the astrolabe and (80) for its construction, not by Gerbert, beg.: "Quando uis scire de horis diei".
Work 9	Author standard	Walcher
	Title (ms.)	A set of lunar tables for the years 1036-1111
	Contents	Calculated from an eclipse observed by the writer on Oct. 18, 1092 (see 90), with explanations in Latin.
	Incipit	(expl.) Qui facultatem computandi eligunt
	Additional remarks	The author was an Englishman (90), and the treatise, though anonymous, is perhaps attributed, like 96-, to Walcher prior of Great Malvern. It appears to have been composed between 1107 and 1112.
	Folio no.	86-
	Additional information	See C.H. Haskins, English historical Review, 30 (1915) 57.
Work 10	Author standard	Petrus Ebreus \| Walcerus
	Title (ms.)	Sententia
	Incipit	Inter. VIIem. planetas per zodiacum circumeuntes
	Folio no.	96-
	Rubric	Sententia Petri Ebrei cognomento Anphus (sc. Alphonsus) de Dracone quam domnus Walcerus prior Maluernensis ecclesie in latinam transtulit linguam
	Other passages	Translated in 1120 (96)
Work 11	Author (ms.)	Athelardus Bathoniensis (tr.) \| Elkaurezmus
	Author standard	Adelardus Bathoniensis \| Maslama Ibn Ahmed al-Madjriti \| Muhammed Ibn Musa al-Khwarizmi
	Title (ms.)	Astronomical tables
	Incipit	(introd.) Liber iste septem planetarum atque Draconis statum continet
	Printed copies	MS. O in A. Björnbo & R. Besthorn, Mémoires de l Académie Royale des Sciences ... de Danemark, ser. 7, section des lettres 3 # 1 (1914); for the Arabic sentences see xxi.
	Additional remarks	159 has been misplaced and should follow 99.
	Folio no.	99v-
	Rubric	Ezich Elkaurezmi per Athelardum Bathoniensem ex Arabico sumptus
	Other passages	Translated in 1126 (see 159).
	Glosses etc.	There are Arabic sentences in the original hand at 103v, 104v, 127v, 132v.
Work 12	Author (ms.)	Yparcus
	Author standard	Martianus Capella
	Title (ms.)	De nutiis Philologiae et Mercurii, De astronomia (frag.of bk. 8)
	Incipit	... causa existente perspicua. quod saltus ille de quo loquimur (in the account of the moon)
	Printed copies	In the amplified form found in, F. Madan, A summary catalogue of western manuscripts in the Bodleian Library at Oxford III (1895) # 14771 and, like that MS., ascribed to Hipparchus.
	Folio no.	160-
	Colophon	Finit liber Yparci ... de cursu siderum
	Additional texts	Incorporated in it are passages from Pliny's Historia naturalis, bk. 6 (161v), Bede (161), and other computistic writers.
Work 13	Title (ms.)	An astronomical note
	Century	s. 13 ex
	Folio no.	182