Note 191 — Chapter XXXVIII
Reading edition
A work that I have not before seen ascribed to him is, Perugia 683, 15th century, fols. 393-6, “Incipit summa magistri Iohannis yspani super arborem de consanguineitate.”
Steinschneider fails, I think, to note in his list of John’s translations an “introductio de cursu planetarum” (St. John’s 188, late 13th century, fol. 99v-) which he translated from Arabic into Latin at the request of two “Angligenarum, Gauconis scilicet et Willelmi.”