* =Kalmia latifolia.=—The broad-leaf laurel is native throughout the greater part of the eastern half of the United States, and is known by a great variety of common names, the most important of which are laurel and ivy. The latter name is most commonly used south of Maryland. Scores of cattle and sheep are poisoned annually by eating the plant. It is probably the most dangerous of all the shrubs belonging to the heath family. [Illustration: $1] [Illustration: $1] * =Leucothoë catesbæi.=—This is the branch ivy, hemlock, or calf-kill, of the Allegheny Mountains. It is well known in that region to be fatal to all kinds of stock. * =Leucothoë racemosa.=—The swamp _Leucothoë_ of the Atlantic and Gulf States has been reported from New Jersey as especially fatal to calves. * =Pieris mariana.=—The stagger bush of the Atlantic Coast region, Tennessee, and Arkansas is commonly known to be poisonous to calves and to sheep. The name stagger bush was applied to the shrub on account of the peculiar intoxicating effect of the leaves. * =Rhododendron californicum.=—The California rhododendron is native on the Pacific Slope from San Francisco to British Columbia. The plant is reported from Oregon as poisonous to sheep. It is quite probable that the leaves contain andromedotoxin, but they have not been tested. [Illustration: $1] * =Rhododendron maximum.=—The great laurel (rosebay; mountain laurel; rhododendron) is a large evergreen bush or small tree which is quite commonly cultivated for ornament, and is found native in the Allegheny Mountains. The leaves contain andromedotoxin, and they are occasionally eaten by stock with fatal effect. PRIMULACEÆ (PRIMROSE FAMILY). =Anagallis arvensis.=—The pimpernel is a European plant which has obtained a specially strong foothold in California, where it grows luxuriantly and is sometimes known as poison weed. It is suspected of having caused the death of a horse at Santa Ana. Chemists have isolated a powerfully poisonous oil and a strongly active ferment from the plant. OLEACEÆ (OLIVE FAMILY). =Ligustrum vulgare.=—The privet, or prim, is a garden shrub, introduced from Europe and Asia, which is much used for hedges, and has escaped from cultivation in western New York and southward to North Carolina. Accidents have been occasioned in children both by the fruit and the leaves. The plant is to be suspected in cases of poisoning in animals. APOCYNACEÆ (DOGBANE FAMILY). =Apocynum androsæmifolium=, spreading dogbane: =A. cannabinum=, Indian hemp.—These plants are generally distributed throughout the United States. Stock generally avoid them in pasture fields on account of their acrid milky juice. When dry they are not so poisonous as when in the fresh state.