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NATURAL HISTORY AND SCIENTIFIC BOOK CIRCULARS recently published, each post free on receipt of the price.

No. 61.—'''BOTANY: Recent Purchases and New Works: Flowering Plants, British Botany. Foreign and Local Floras. Ferns, Mosses, Fungi, Lichens, Algæ. Herbals and Ancient Botany. Economic Botany: Fruit-Trees, Gardening, Orchids, Tea-Culture. Trees and Forestry. Entomology.''' 32 pp. Price 2d.

No. 62.—'''THE OCEAN; FISHES, MOLLUSCA, SHELLS, CRUStacea, Foraminifera. Seals, Whales, Reptiles. Zoology: Entomology, Mammalia, Ornithology. General Natural History, Voyage, and Travel. Botany.''' 32 pp. Price 2d.

No. 63.—'''GEOLOGY, MINERALOGY. MINING, AND PALÆONtology. Also Works on Botany, Conchology Entomology, Fishes, Birds, Mammalia.''' 32 pp. Out of print.

No. 64.—'''ASTRONOMY, MATHEMATIICSMATHEMATICS [sic], ELECTRICITY, GRAvitation, Acoustics, Aëronautics. Heat. Light, Optics. Meteorology, Chemistry, Microscopy.''' 48 pp. Price 2d.

No. 65.—BOTANY, CONCHOLOGY, ENTOMOLOGY, FISHES, Mammalia, Ornithology, Astronomy, Chemistry, Electricity, Geology, Mathematics, Optics, Meteorology. 48 pp. Price 2d.

No. 66.—ENTOMOLOGY, MISCELLANEA ENTOMOLOGICA, Coleoptera, Lepidoptera, Hymenoptera, Orthoptera, Diptera, Hemiptera, Neuroptera. Price 2d.