Neither Prof. Ellis in his Appendix Vergiliana (Oxonii, 1907) nor Prof. Vollmer in his edition of the same (Lipsiae, 1910), though the latter gives a long list of MSS, makes any mention of a Luxemburg MS containing the Moretum. The MS is numbered 27 (M. 9. 16), is of the twelfth century, and was formerly in the library of a monastery at Orval (Aurea Vallis). The Luxemburg collection is not as well known as it ought to be. A catalogue of the MSS was published in 1894 by the then custodian N. van Werveke, but the small number of copies issued does not seem to have fallen into the hands of those most interested. I have to thank the present librarian, Dr. d'Huart, for his kindness to me on the occasion of my recent visit to the library.