On the protection of transactions against claims in Ir. contractual law. Apps. contain details on (I) natural entitlement, (II) unwarranted promises, and (III) the aire coisring.
Refutes the view that YBL originates directly from LU, and argues it belongs to a group of MSS deriving from a source independent of LU. A criticism of T. Ó Concheanainn, in Celtica 17 (1985), pp. 73-90, Éigse 16 (1975), pp. 146-162, etc.