WITH reference to a review, appearing in the Supplement to NATURE for Oct. 4, of the list of place-numbers of societies issuing serial publications contained in the General Library of the British Museum (Natural History), I have been desired to point out that this List, being a General Library List, does not include the more special serials housed in the five Departmental Libraries of the Museum. This would account for the list's apparent weakness in specific branches of natural science, so justly commented upon by your reviewer.