Note 342 — Chapter III
Reading edition
Montucla, Biogr. Univ. It is however certain, and is admitted by Delambre, the author of this article in the Biog. Univ., that Purbach made considerable progress in abridging and explaining the text of this translation, which, if ignorant of the original, he must have done by his mathematical knowledge. Kästner, ii. 521.