The members of this order have most of them rough hairy leaves, they contain a certain amount of nitrate of potash in their juices, and it is this which gives them the peculiar taste which has gained for them the name of "Oyster plants;" the common Borage has been used as a remedy for coughs. 14. LINIACEÆ, or } (Salvia officinalis) Sage. LABIATES } (Thymus vulgaris) Thyme. (Mentha viridis) Spear Mint. [Illustration: Sage.] The name Labiates has been given from the form of their infloresence, which is generally "Labiate" (having lips); they frequently possess aromatic properties, and are mostly of a strong smell. Although not commonly used as food, yet most of them are employed to flavour it, as Mint, Thyme, Sage, and many more. 15. SOLANACEÆ (Atropa belladonna) Deadly Nightshade. (Solanum tuberosum) Potato. (Capsicum annuum) Capsicum. (Hyoscyamus niger) Henbane. (Nicotiana Tabacum) Tobacco. [Illustration: Tobacco.] A great many members of this order are poisonous, among which the Deadly Nightshade (Atropa Belladonna) is the most virulent, there are also Henbane and Tobacco, both strong poisons; but, to compensate for this bad character, the order contains one of the most useful vegetables used in Europe--the Potato. This is the tuber of the "Solanum tuberosum." The following account of the introduction of the Potato into England is from the "Penny Cyclopædia":--