[Illustration: $1] Tobacco poisoning may be produced by baths or lotions containing tobacco juice, which is often used as a parasiticide. The ingestion of tobacco leaves in forage may also produce poisoning. Doses of 1 ounce in the goat and 10 ounces in the ox are toxic. =The symptoms= consist in salivation, vomiting, nausea, diarrhœa, cardiac palpitation and dyspnœa. =The lesions= are those of gastro-enteritis with cerebral congestion. =Treatment= consists in giving tannin, black coffee, etc. =Solanum dulcamara.=—The bittersweet, or climbing nightshade, is a European weed, now introduced in the north-eastern quarter of the United States. The leaves are suspected of being poisonous to stock. * =Solanum nigrum.=—The black nightshade (common nightshade; garden nightshade) is a common weed in cultivated fields throughout the greater portion of the United States. Cattle seldom eat the plant, but a few cases of poisoning are recorded for calves, sheep, goats, and swine. * =Solanum triflorum.=—The spreading nightshade is a native of the Great Plains (United States), and also a common garden weed from Arizona and Texas to British America. Complaints of the poisoning of cattle by this plant have been sent to the Department of Agriculture from Nebraska. Experiments show that the berries are poisonous. =Solanum tuberosum.=—The small, immature tubers of the common cultivated potato and those that have turned green from exposure to the sun are slightly poisonous. The green fruit and the white sprouts from mature potatoes are likewise poisonous. In all of these cases the deleterious substance may be removed or destroyed by thorough boiling. SCROPHULARIACEÆ (FIGWORT FAMILY). [Illustration: $1] =Digitalis purpurea.=—The purple foxglove is a common garden plant which has sparingly escaped from cultivation and is naturalised to some extent on Cape Breton Island. Horses are occasionally poisoned in Europe by nipping the plants from gardens or by eating hay contaminated with it. =Gerardia tenuifolia.=—The slender gerardia is native to the eastern half of the United States, and has been specially reported as poisonous to sheep and to calves in the Southern States. =Gratiola officinalis.=—The hedge hyssop of the Southern States contains an acrid poison. The same plant grows in Europe, and is there regarded as poisonous to stock. =Pedicularis.=—The plants of this genus are commonly called lousewort. In Europe several species are suspected of being slightly poisonous to stock. One of these, _P. palustris_, occurs in Labrador, and there are over thirty species native to the United States, largely Western. They should all be suspected of being poisonous. CAMPANULACEÆ (BELL-FLOWER FAMILY).