Farmer’s Bulletin No. 47, Insects Affecting the Cotton Plant; No. 447, Bee Keeping; No. 440, The Peach Twig Borer; No. 120, The Principal Insects Affecting the Tobacco Plant; No. 856, Important Insecticides; No. 835, The Principal Insect Enemies of Growing Wheat; No. 799, Carbon Bisulphide as an Insecticide; No. 243, Insecticides and Fungicides; No. 152 (revised) Mange in Cattle; No. 155, How Insects Affect Health in Rural Districts; No. 492, The Control of the Codling Moth; No. 172, Scale Insects and Mites on Citrus Trees; No. 196, Usefulness of the Toad; No. 209, Controlling the Boll Weevil in Cotton Seed and at Ginneries; No. 211, The Use of Paris Green in Controlling the Cotton Boll Weevil; No. 872, The Cotton Bollworm; No. 848, The Control of the Boll Weevil; No. 223, Miscellaneous Cotton Insects in Texas; No. 908, The Control of the Codling Moth and Apple Scab. Bulletins of the Bureau of Entomology may be obtained from the same source, while the supply lasts, as follows: Destructive Locusts; The Honey Bee; The San José Scale; The Principal Household Insects of the United States; The Gypsy Moth in America; The Periodical Cicada; The Chinch Bug; The Hessian Fly; Insects Injurious to Vegetables; Notes on Mosquitoes; Some Insects Attacking the Stems of Growing Wheat, Rye, Barley, and Oats. Bulletins on Similar Topics, Published by the Department of Agriculture, Ontario— (Write to the Publications Branch) Bulletin No. 187—The Codling Moth Bulletin No. 195—The Insecticides and Fungicides Bulletin No. 198—Lime Sulphur Wash Bulletin No. 219—The San José and Oyster-shell Scales Bulletin No. 241—Peach Growing in Ontario Bulletin No. 250—Insects Attacking Fruit Trees Bulletin No. 251—Insects Affecting Vegetables Bulletin No. 256—The Wintering of Bees Bulletin No. 257—The More Important Fruit Tree Diseases in Ontario Bulletin No. 258—The More Important Fungus and Bacterial Diseases of Vegetables in Ontario Bulletin No. 271—The Apple Maggot Bulletin No. 276—Bee Diseases in Ontario Bulletins Published by the Department of Agriculture, Ottawa— (Write to the Publications Branch) Bulletin No. 9—The Army Worm Bulletin No. 10—Cutworms and their Control Bulletin No. 26—Bees and How to Keep Them Circular No. 9—1921—Common Garden Insects and their Control [Illustration: Pearl divers. ] CHAPTER IX _MOLLUSCS_ THE FRESH-WATER MUSSEL SUGGESTIONS.—The mussel is usually easy to procure from streams and lakes by raking or dredging. In cities the hard-shelled clam, or quahog, is for sale at the markets, and the following descriptions apply to the anodon, unio, or quahog, with slight changes in regard to the siphons. Mussels can be kept alive for a long time in a tub with sand in the bottom. Pairs of shells should be at hand for study.