The umbellifers include a number of outlaws such as the water-dropworts and cowbane; but among the dangerous members of the tribe there is only one that attains to real greatness, and that of course is the hemlock, a poisoner of old-established renown, as witness the death of Socrates. "Root of hemlock digg'd i' the dark" is one of the ingredients in the witches' cauldron in _Macbeth_, and the hemlock's name has always been one to conjure with, which may account for the fact that several kindred, but less eminent plants unlawfully aspire to it, and are erroneously thus classed. But the true hemlock is unmistakable: the stout bloodspotted stem distinguishes it from the lesser crew; its finely cut fernlike leaves are exceedingly beautiful; and it is of stately habit--I have seen it growing to the height of nine feet, or more, in places where the surrounding brushwood had to be overtopped. Let us give their due, then, to these outlaws of whom I have spoken, these Robin Hoods of the floral world. Bandits and highwaymen they may be; but after all, our woods and waysides would be much duller if they were banished. XX SOME MARSH-DWELLERS Here are cool mosses deep. TENNYSON. WHAT Thoreau wrote of his Massachusetts swamps is hardly less true of ours; a marsh is everywhere a great allurement for botanists. By a road which crosses a certain Sussex Common there is a church, and close behind the church a narrow swampy piece of ground known as "the great bog," which has all the appearance of being waste and valueless; yet whenever I visit the place I think of Thoreau's words: "_My_ temple is the swamp." For that bog, ignored or despised by the dwellers round the Common, except when a horse or a cow gets stuck in it and has to be hauled out with ropes, is sacred ground to the flower-lover, as being the home not only of a number of characteristic plants--lesser skull-cap, sun-dew, bog-bean, bog-asphodel, marsh St. John's-wort, and the scarcer species of marsh bedstraw--but of one of our rarest and most beautiful gentians, the Calathian violet, known and esteemed by the old herbalists as the "marsh-felwort."