. Controlling rats and mice. Mice; Rats. r '. Fig. 14. Poison station for house mice (using drinking fountain for baby chicks). Poisoned ma- terial in the jar flows into open-topped metal base where mice can feed. The jar should be labeled POISON. This device should be used only in a place that can be securely locked to prevent entry by children, unauthorized per- sons, or pets, and where the odor of dead mice will not be objectionable. are issued by city health departments to citizens for rat control about homes; but prebaiting then is impossible. A liquid red squill extract is also avail- ab
. Controlling rats and mice. Mice; Rats. r '. Fig. 14. Poison station for house mice (using drinking fountain for baby chicks). Poisoned ma- terial in the jar flows into open-topped metal base where mice can feed. The jar should be labeled POISON. This device should be used only in a place that can be securely locked to prevent entry by children, unauthorized per- sons, or pets, and where the odor of dead mice will not be objectionable. are issued by city health departments to citizens for rat control about homes; but prebaiting then is impossible. A liquid red squill extract is also avail- able, but generally it seems less efficient than the powder. One pint of liquid serves to moisten % pound of bait (meal, or stale bread cut in V^-inch cubes). Zinc Phosphide. This chemical (Zn3 P2) is a heavy dark gray powder with a faint odor of phosphorus resulting from the slow release of phosphine (PH3). Both the powder and gas are serious poisons. Zinc phosphide should be weighed, mixed, and handled only out- of-doors or in a well-ventilated room, and workers should wear gloves of leather or rubber when mixing or distributing poison baits. Bait Zinc phosphide, powdered Formula 2 96 to 100 parts by weight 1 part by weight Corn oil, mineral oil, or glycerin, at 12 to 24 fluid ounces per 100 pounds of bait, is often added to any dry cereal to make the poison adhere. The bait and poison are first mixed dry until the zinc phos- phide becomes an evenly distributed coat- ing. Then the oil, well warmed, is added slowly and the mixture is stirred again. Baits may be cereal or bread crumbs alone or may include some fresh fish, horse meat, or hamburger. Ground apple or carrot are sometimes used. Stale bread, without an oil, but mixed with an equal amount of water, has been used with 2% to 5 per cent zinc phosphide in England. Antu. The chemical known as antu (alphanapthyl-thiourea) is of use in con- trol of Norway rats. It is a fine bluish- gray powder that keeps well when dry and is i
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