Here, too, as in China and Manchuria, nearly all crops are planted in rows, including the cereals, such as wheat, rye, barley and oats. We traversed first a flat marshy country with sandy soil and water not more than four feet below the surface where, on the lowest areas a close ally of our wild flower-de-luce was in bloom. Wheat was coining into head but corn and millet were smaller than in Manchuria. We had left New Wiju at 7:30 in the morning and at 8:15 we passed from the low land into a hill country with narrow valleys. Scattering young pine, seldom more than ten to twenty-five feet high, occupied the slopes and as we came nearer the hills were seen to be clothed with many small oak, the sprouts clearly not more than one or two years old. Roofs of dwellings in the country were usually thatched with straw laid after the manner of shingles, as may be seen in Fig. 210, where the hills beyond show the low tree growth referred to, but here unusually dense. Bundles of pine boughs, stacked and sheltered from the weather, were common along the way and evidently used for fuel. At 8:25 we passed through the first tunnel and there were many along the route, the longest requiring thirty seconds for the passing of the train. The valley beyond was occupied by fields of wheat where beans were planted between the rows. Thus far none of the fields had been as thoroughly tilled and well cared for as those seen in China, nor were the crops as good. Further along we passed hills where the pines were all of two ages, one set about thirty feet high and the others twelve to fifteen feet or less, and among these were numerous oak sprouts. Quite possibly these are used as food for the wild silkworms. In some places appearances indicate that the oak and other deciduous growth, with the grass, may be cut annually and only the pines allowed to stand for longer periods. As we proceeded southward and had passed Kosui the young oak sprouts were seen to cover the hills, often stretching over the slopes much like a regular crop, standing at a height of two to four feet, and fresh bundles of these sprouts were seen at houses along the foot of the slopes, again suggesting that the leaves may be for the tussur silkworms although the time appears late for the first moulting. After we had left Seoul, entering the broader valleys where rice was more extensively grown, the using of the oak boughs and green grass brought down from the hill lands for green manure became very extensive.