HUG 1, ff. 175r-176v, inc. Quod si a puncta C ductis
Incipit:Quod si a puncta C ductis
A double folio (195 x 140) formerly pasted on the left to f. 177r, which itself was loose; now all hinged in. Ff. 175v-176r blank. Diagrams and geometric explanations related to the planetarium; cf. OC 21: 143-8.