=Ground Ivy= (_Nepeta Glechoma_ Benth.) is, according to Schaffner, poisonous to horses. It contains a volatile oil and bitter principle, as also does Catmint (_N. Cataria_). In a case which came before the Board of Agriculture and Fisheries in 1906 three horses became ill with symptoms of poisoning, and the only weed found in the lucerne they were getting was Ground Ivy, and this was suspected but not proved to be the cause. In a further case, reported in 1909, eleven horses were believed to have been poisoned by this weed, and in one of the dead horses scarcely any food but Ground Ivy was found, and to it the veterinary surgeon in attendance attributed death. During preceding years several horses had died in the locality (Ely), owing, it was believed, to poisoning by the same weed. The losses, however, were not _proved_ to be due to this plant. In the _Veterinary Journal_ (October, 1914, p. 515) poisoning of horses by this weed was noted (after Ferenczhazsy in the _Recueil de Médecine Vétérinaire_). The author observed nine cases of intoxication due to the weed, though it is stated that it “has occasioned no trouble in cattle and sheep that consumed it.” The symptoms in horses were “anxious look, dyspnœa, salivation, sweating, dilatation of the pupils, cyanosis, signs of pulmonary œdema.” Two horses died. In 1913 similar cases were observed by other owners, and terminated fatally. Hooker states that _N. Glechoma_ is “bitter and aromatic, formerly used for beer, occasionally for tea.” =Orache= (_Atriplex_ sp.). So far as known these plants are not poisonous, but it may be stated that Greshoff found the seeds of five species, and the leaves of two species, to contain a _Saponin_. =Nettles= (_Urtica_ sp.). Nettles are not generally regarded as poisonous otherwise than as causing painful nettle rash on the bare skin, but _Urtica dioica_ L. is stated to have caused the death of dogs (_Berliner Tierärztliche Wochenschrift_, 1909). =Yellow Flag= (_Iris Pseud-acorus_ L.). The wild Flag was noted by Linnæus as dangerous to cattle, but no case of actual poisoning has been found in the literature. The plant is stated to have marked emetic and purgative properties, and Cornevin remarks that in Belgium intense gastro-enteritis is attributed to it. It contains the glucoside _Iridin_ (C_{24}H_{26}O_{13}).