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adhesive amongst ants appliance bait Barium carbonate powder black beetle black rat borax brick brickwork brown rat burrows carried cats cause cement cockroaches concrete consumed CROSBY LOCKWOOD damage danger deal destroy destructive measures difficult disease drain effective employed entrance escape exist exits experienced extract of squill fatal flies floor foodstuffs frequent fumes fumigant gallon gassing gnaw ground habits hole house fly house mouse Illustrations infested with rats insects interceptor laid large numbers less matter means method of destruction mixed mixture mortar mouse oatmeal objectionable obtained odour operation opportunity pests Plaster poison Portland cement possible practically precautions prepared presence prevent probably quantities of food ratcatcher ratlime rats and mice remedy rodents Rolled oats roof runs serious sewer ships similar smell soon spread Steel Square sufficient suitable Sulphur dioxide taken trouble type of trap types of vermin usually varnish virus warehouses water seal wire zinc