The _Water Cress_ (_Nasturtium officinale_) is among cresses, to use an American simile, the "finest toad in the puddle." This is because of its superlative medicinal worth, and its great popularity at table. Early writers called the herb "Shamrock," and common folk now-a-days term it the "Stertion." Zenophon advised the Persians to feed their children on Water-cresses (_kardamon esthie_) that they might grow in stature and have active minds. The Latin name _Nasturtium_ was given to the Watercress because of its volatile pungency when bruised and smelt; from _nasus_, a nose, and _tortus_, turned away, it being so to say, "a herb that wriths or twists the nose." For the same reason it is called _Nasitord_ in France. When bruised its leaves affect the eyes and nose almost like mustard. They have been usefully applied to the scald head and tetters of children. In New Zealand the stems grow as thick as a man's wrist, and nearly choke some of the rivers. Like an oyster, the Water-cress is in proper season only when there is an "r" in the month. According to an analysis made recently in the School of Pharmacy at Paris, the Water-cress contains a sulpho-nitrogenous oil, iodine, iron, phosphates, potash, certain other earthy salts, a bitter extract, and water. Its volatile oil which is rich in nitrogen and sulphur (problematical) is the sulpho-cyanide of allyl. Anyhow [130] there is much sulphur possessed by the whole plant in one form or another, together with a considerable quantity of mineral matter. Thus the popular plant is so constituted as to be particularly curative of scrofulous affections, especially in the spring time, when the bodily humours are on the ferment. Dr. King Chambers writes (_Diet in Health and Disease_), "I feel sure that the infertility, pallor, fetid breath, and bad teeth which characterise some of our town populations are to a great extent due to their inability to get fresh anti-scorbutic vegetables as articles of diet: therefore I regard the Water-cress seller as one of the saviours of her country." Culpeper said pithily long ago: "They that will live in health may eat Water-cress if they please; and if they won't, I cannot help it."