In many of our midland and northern counties most of the meadows lie in parallel undulations or "rigs." These are generally about a furlong (220 yards) in length, and either one or two poles (5-1/2 or 11 yards) in breadth. They seldom run straight, but tend to curve towards the left. At each end of the field a high bank, locally called a balk, often 3 or 4 feet high, runs at right angles to the rigs. In small fields there are generally eight, but sometimes ten, of these rigs, which make in the one case 4, in the other 5 acres. These curious characters carry us back to the old tenures, and archaic cultivation of land, and to a period when the fields were not in pasture, but were arable. They also explain our curious system of land measurement. The "acre" is the amount which a team of oxen were supposed to plough in a day. It corresponds to the German "morgen" and the French "journee." The furlong or long "furrow" is the distance which a team of oxen can plough conveniently without stopping to rest. Oxen, as we know, were driven not with a whip, but with a goad or pole, the most convenient length for which was 16-1/2 feet, and the ancient ploughman used his "pole" or "perch" by placing it at right angles to his first furrow, thus measuring the amount he had to plough. Hence our "pole" or "perch" of 16-1/2 feet, which at first sight seems a very singular unit to have selected. This width is also convenient both for turning the plough, and also for sowing. Hence the most convenient unit of land for arable purposes was a furlong in length and a perch or pole in width. The team generally consisted of eight oxen. Few peasants, however, possessed a whole team, several generally joining together, and dividing the produce. Hence the number of "rigs," one for each ox. We often, however, find ten instead of eight; one being for the parson's tithe, the other tenth going to the ploughman. When eight oxen were employed the goad would not of course reach the leaders, which were guided by a man who walked on the near side. On arriving at the end of each furrow he turned them round, and as it was easier to pull than to push them, this gradually gave the furrow a turn towards the left, thus accounting for the slight curvature. Lastly, while the oxen rested on arriving at the end of the furrow, the ploughmen scraped off the earth which had accumulated on the coulter and ploughshare, and the accumulation of these scrapings gradually formed the balk. It is fascinating thus to trace indications of old customs and modes of life, but it would carry us away from the present subject. Even though the Swiss meadows may offer a greater variety, our English fields are yet rich in flowers: yellow with Cowslips and Primroses, pink with Cuckoo flowers and purple with Orchis, while, however, unwelcome to the eye of the farmer, the rich Buttercup Its tiny polished urn holds up, Filled with ripe summer to the edge,[36]