Johannes de Sacro Bosco, Tractatus de sphaera, with marginal annotations. Decoration: Diagrams (ff. 17r-18r, 23r, 25v-26r, 27r) and a table (f. 25v). Large initial in gold and colours at the beginning of the text (f. 17r). Smaller initials in red or blue with penwork decoration in the other co...
