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H H H 46 THE MEDIEVAL TRADITION OF MECHANICS their results easily available is one which we know Arabic editors often did undertake. In particular, al-Khazinl provides summaries of this kind for a number of works on the balance and the qarastun, as well as on the principles of weight and centers of gravity 11. It is thus quite plausible that the Latin Excerptum was produced as a paraphrase of a similar excerpt made by an Arabic editor from Thabit's writing. A second indication of the reliability of Gerard's version is its inclusion of the preface and the epilogue missing from the Arabic.

Qar. (" as has been proved in the 4th and 5th theorems of the theorems of Thabit ibn Qurra "): (L. ) When line RB is denuded of the mass of portion RBQD and the weights are suspended in aggregate from the middle point of the line RB - namely, the point U - then the line remains in parallel-ness with the horizon. (K. Qar. ) AGTS is suspended from the point H which is the point of the middle of line GT, then beam ABGD also remains in parallel-ness with the horizon. By means of the general principle of equilibrium for massless beams, each obtains its final step: (L.

AE, El. and Aim. , Opt. omit quidem as often as not. Correspondingly, none of the three appearances of vero in 1. Can. is preceded by the suggested quidem. , 1. Can. places ergo second in its clause; a single exception (1. 55) places it first, suggesting a basis in the less common OUXOUv. , 99, 20; 109, 12). One may mark the similarity of Latin style linking the Optics and 1. Can. , parallelus recta), as in Greek (d. note 10 above for the same usage in 1. ). LE"t'C1. LEVOV (d. notes 15, 16), aequiangulus for tcrOywvLOV.

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