Digby 71, 14-16th century, fols. 85-97, Titulus as in Addit. 32622, imperfect, leaving off in the midst of “Arithmetic.”

Digby 153, 14th century, fols. 148-67v.

Rawlinson C, 7, 14th century, fols. 51-87, mutilated at close.

Corpus Christi 132, 15th century, fols. 1-59, Titulus as in Addit. 32622 and Digby 71.

CU Trinity 1082, 15th century, fols. 1-110.

CU Trinity 1144, late 15th century, fols. 9-54v.

CU Trinity 1351, late 15th century, fols. 1-25, James gives no general title, but his description is sufficient to identify it with our treatise.

Gonville and Caius 413, 15th century, #4, 31 fols.

CHAPTER LXVI

PICATRIX