THE ESSEX MUSEUM 81 Perithecial Oak Mildew. While examining the mildew, Microsphaera alphetoides, on oak leaves during the Club's Fungus Foray on October 18th, 1947, Dr. P. H. Gregory found a specimen which bore perithecia. I sub- mitted the specimen to the authorities at Kew and have been notified that they had only once before seen Perithecial material of oak mildew from Britain (Hertfordshire). They were therefore very glad to have the specimen of this very rare state for the Herbarium. G. B. Hilbert. THE ESSEX MUSEUM A FURTHER GIFT OF BOW PORCELAIN Since the announcement of his original donation to the Club's museum (see Essex Naturalist, vol. xxvii, p. 296), Mr. T. Leonard Crow has added the following pieces of Bow porcelain :— 1. Half-length Female Figure of Eastern type (a rare early piece), all white, in figured open-front bodice and with curious head-dress. On wood base. Height (without base) 71/2 inches, extreme breadth 5 inches. No mark. Date circa 1748. 2. Coffee Pot, with lid (a very rare piece), polychrome floral decoration on white body. Extreme height 61/2 inches. Date 1752-5. 3. Three-tiered Shell Stand for sweetmeats, on separate base. Dark- blue on white. Tiers with three, three and one shells, alternated. Height (without base) 111/2 inches, extreme width 91/2 inches. The separate base, height 41/2 inches, extreme width 71/2 inches. Date 1750-5. 4. Plate, circular with escalloped border, polychrome floral decoration on white, triangular foot-ring. Red anchor mark. 5. A "Bow Girl." Five inches high. White body, decorated. Carry- ing on left arm a basket of polychrome flowers, a garland on head, an ornamented scarf over the right shoulder passing down to and around the left hip. Anchor and dagger mark in red. Date 1755-60. Percy Thompson, Curator. THE LIBRARY Among recent additions to the Museum Library are the following books: Dating the Past. Frederick E. Zeuner. 1946. A first attempt to combine diverse methods of dating the past in a new branch of science called geochronology. The Trematoda of British Fishes. Ben Dawes. 1947. A Ray Society monograph on the trematode worms which parasitise fishes. A Catalogue of Maps in the Essex Record Office, 1566-1855. Compiled by F. G. Emmison, County Archivist. 1947. To call this valuable work a "catalogue" is indeed ultra-modest; it is a fully descriptive account.