xii PREFACE.
Afdajus (Brewer, pp. 38, 99, 117, 227). It is a treatise on the propagation of radiant forces, usually spoken of as Multeplicatio Specterunt, but in one passage entitled Tractatus de Radits, quem vobis musi separatim ab Opere A/ajer?, In the present edition this treatise will be found in its proper place as an appendix to the Opus Alagus.
It must be added that the text, as edited, is in certain parts of the work far from perfect. This remark applies especially to the third and sixth sections. In the third section several missing pages have been supphed from a Cottonian MS. (Julius D.v.}, con- taining amongst other things a Greek and a Hebrew alphabet. It is the more remarkable that Jebb should have omitted these passages, since it is clear that he had consulted this MS. and had made frequent correc- tions from it. he sixth section, on Experimental Science, has been so carelessly edited that it seems probable that the editor must have entrusted the work to a less competent assistant. Contractions of the most ordinary kind arc misinterpreted (as e.g. ‘e converso’ is rendered ‘ergo, ‘conclusio’ is written ‘quaestio, &c.), and in some passages sentences have been omitted. While indicating these shortcomings, it ought at the same time to be added that other parts of the work give proof of great labour and care in the collation of the MSS. consulted. ‘his is especially the case with the fourth and fifth parts, which form a very large proportion of the whole work. Having spent much time over the MSS. used by Jebb, in addition to others, I can bear testimony to the accuracy with which variations have here been noted. All of them which are of more than verbal importance have been noted in the present edition.
