For further bibliography of Adelard’s writings see the articles on _Adelard of Bath_, by Professor C. H. Haskins in EHR 26 (1911) pp. 491-8, and 28 (1913) 515-6. These articles will henceforth be cited as _Haskins (1911)_ and _Haskins (1913)_. [27] _De eodem et diverso_, p. 32. [28] Haskins (1911) p. 491, who has, however, himself done much to clear up this obscurity. I largely follow his account in the ensuing biographical and bibliographical details. [29] But the passage giving this date has been found in but one MS; Suter (1914), pp. 5, 37. [30] R. L. Poole, _The Exchequer in the Twelfth Century_, London, 1912, p. 56. [31] CU McLean 165, “Heynrice cum sis regis nepos”; Haskins (1913) pp. 515-6. [32] Namely, the translation of Euclid, _De eodem et diverso_, and _Liber Ezich_. [33] Ed. Boncompagni, _Bullettino di Bibliografia e di Storia della Scienze matematiche_, XIV, 1-134. [34] Unless indirectly through Gerbert. [35] The numerous MSS vary so in text and arrangement that it is not clear whether Adelard’s work in its original form “was an abridgement, a close translation, or a commentary,” (Haskins (1911) 494-5). Professor David Eugene Smith states in his forthcoming edition of Roger Bacon’s _Communia Mathematicae_, which he has very kindly permitted me to see in manuscript, that Roger refers several times to Adelard’s _Editio specialis super Elementa Euclidis_--“a work now entirely unknown.” [36] _Liber ysagogarum Alchorismi in artem astronomicam a magistro A. compositus_: Haskins (1911) p. 493 for MSS. [37] Ed. Curtze, in _Abhandl. z. Gesch. d. Math._, VIII, 1-27. [38] Haskins (1911) p. 494. [39] _Ibid._, 495, _Ysagoga minor Iapharis mathematici in astronomiam per Adelardum bathoniensem ex arabico sumpta_. It is perhaps worth noting the similarity of the _Incipit_, “Quicumque philosophie scienciam altiorem studio constanti inquirens....” (Digby 68, 14th century, fols. 116-24), to the three _“Quicumque” Incipits_ mentioned in our chapter on Gerbert (see above, Chapter 30, vol. I, page 707.) [40] Royal 15-C-IV. [41] Berthelot (1906) 172-77, “Adelard de Bath et le _Mappe Clavicula_,” as well as the citations from other writings of Berthelot by Haskins (1911) 495-6. [42] “Aliquid arabicorum studiorum novum me proponere exhortatus.” [43] “Nepos quidam meus in rerum causis magis implicans quam explicans.” [44] _De eodem et diverso_, p. 2, “Tu utrum recte texam animadverte, et ea qua soles vel in sophismatum verboso agmine vel in rhetoricae affectuosa elocutione modesta taciturnitate utere.” [45] Adelard uses the word _modernus_ a number of times, and usually of his own age, although in one passage of the _De eodem et diverso_ (p. 7, line 3) he speaks of the Latin writers, Cicero and Boethius, as _modernos_ in distinction from Greek philosophers of whom he has previously been speaking. Other uses of the word in _De eodem et diverso_ to apply to his own age are: p. 3, line 3; p. 19, line 24; p. 22, line 33.