If fresh apple peelings from Pirus Malus, L. are covered with water and then distilled with steam, according to C.Thomae1) but little solid substance passes over. Occasionally oily drops are formed which soon congeal almost entirely. When the distillate is shaken out with ether, a solid mass results which crystallizes when moistened with alcohol. When filtered, a yellow oil results which has the odor of apples.

From numerous rosaceous plants hydrocyanic acid and benz-aldehyde have been obtained: from the leaves, twigs and seeds of the peach tree, Prunus Persica, jess., from the fleshy part of the cherry (Prunus Cerasus, L), from the kernel of the plum (Prunus domestica, L), from the bark, leaves, flowers and seeds of Prunus Padus, L, and from the young leaves and the flowers of Prunus spinosa, L. (Ger. Schlehe). An enumeration of all of these plants and parts of plants would lead too far, since there is no practical reason for so doing. Hence reference should be had to C. Wehmer's Die Pflanzenstoffe Jena, Gustav Fischer), where from p. 273 to p. 306 the entire literature may be found. A list of all plants yielding benzaldehyde and hydrocyanic acid will be found on p. 531 of vol. I of this work.