=Tormentil= (_Potentilla Tormentilla_ L.). In relation to supposed bracken poisoning (see p. 87) in regard to which experiments were conducted by the Board of Agriculture and Fisheries, Tormentil occurred in several instances with the bracken in localities where this plant was reported to cause poisoning. Two feeding experiments in which the weed was fed to heifers gave negative results. In a further case, however, 4 or 5 lb. were collected from a field where sick animals were grazing, and fed to a heifer; it appeared to be the cause of rise of temperature (to 106° F.), diarrhœa, and the passing of a considerable quantity of blood in the fæces for three days, after which the animal improved. It was, however, slaughtered, and lesions were found similar to those found in animals dying in the field from so-called bracken poisoning. Though the plant was suspected, results generally were not held to prove that it was the cause of poisoning (25). According to Van Rijn the root of Tormentil contains a considerable quantity of _Chinovic acid_ (C_{ 32}H_{ 48}O_{ 6}?).
=Wall-Pepper= (_Sedum acre_ L.) is regarded as emetic and purgative, but to lose the harmful properties on drying.
=Sundews= (_Drosera_ sp.) are reputed to be poisonous to sheep, but no evidence has been found.
=White-Rot= or =Marsh Penny-Wort= (_Hydrocotyle vulgaris_ L.) is stated to have caused inflammation of the digestive tract, and hæmaturia; and to contain a toxic substance _Vellarin_ (213).
=Wild Parsnip= (_Pastinaca sativa_ L.). This plant has often been supposed to be poisonous, but Pammel shows that in Iowa the plant is quite harmless, as it appears to be in Britain.
=Devil’s-Bit= (_Scabiosa succisa_ L.) is stated by Moir to have caused injury to cattle in one instance (_Vet. Record_, 1899), causing salivation, gritting of the teeth, twitching of facial muscles, and slightly protruded, abraded, swollen and sensitive tongue. An experiment on cattle showed the plant to induce violent inflammation of the mouth and tongue.
=All-Heal= (_Valeriana officinalis_ L.) is not likely to be eaten by stock in sufficient quantity to cause poisonous symptoms, though it is stated to contain the poisonous _Valerianic acid_ and _Oil of Valerian_. According to Chevalier (_vide_ Henry) this plant contains an alkaloid not yet fully characterised.