258 ON THE AIMS AND USES OF PROVINCIAL MUSEUMS. It may be that to some of our readers what has been said may seem needless, or even hurtful, as tending to discourage many that would wish to be liberal donors, but who would shrink from offering what may be refused by the directors of museums managed on such principles. But there is little risk of a result prejudicial to the best interests of the institutions ; while it would be a very great advantage to be free from the burden of accumulations of material useless at the best, and even injurious as interfering with the efficient fulfilment of the chief uses of the museums to the districts, to the scientific public, and most of all to the societies that undertake the work of forming them. Pomatorhine Skua in the Blackwater.—On December 19th last I saw here at Barham's two immature Pomatorhine Skuas (Stercorarius pomatorhinus). One was shot by Joe Stubbins off Heybridge Basin, the other by Sam Barham off Bradwell Chapel. I believe a third was obtained about the same time, as John Barham told me that Joe Handley, or one of his boys, had shot a strange gull on the river. It was this I called at Barham's to see, but could learn nothing of it, nor have I heard since what became of it, but as it was described as a brown gull, I have little doubt it was another Skua in its first year's plumage.—Edward A. Fitch, Maldon. Local Museums.—"The Museum should be the centre of scientific teaching in all branches. It should have a library of reference of not less than 500 volumes, a well-appointed laboratory, a lecture theatre, and cabinets of specimens arranged especially for teaching purposes ; and it should either be itself a College of Science, with professors attached to it, or it should be in such contact with all scientific teachers in the town that they may make use in turn of the rooms and appliances provided there. For this purpose the building must be in a central position, readily accessible. The whole contents and resources of the Museum must be open to students under proper supervision ; and for their use specimens, other than those from the locality, must be provided. These must not be collected at random, but carefully selected as typically representing species, genera, families, or orders, which are not found in the locality."—F. T. MOTT. "Everything in the Museum should have some distinct object. . . . and everything else should be rigorously excluded. The curator's business will be quite as much to keep useless specimens out of the Museum as to acquire those that are useful. . . . Above all things, let the following words of Agassiz be remembered: 'The value of a Museum does not consist so much in the number as in the order and arrangement of the specimens contained in it.'"— Prof. W. H. Flower.