Studies five Latin lemmata that were glossed both in Old Irish and in Old Breton in the course of the manuscript tradition of the Institutiones: 1. OIr. bí gl. pix; 2. bélat gl. competum; 3. OIr. glés and marcír gl. striglis; 4. cucan(n) gl. penus, etc.; 5. torc allid gl. aper.