pole is excepted, and no wheelbarrow in the world permits so high an efficiency of human power as the Chinese, as must be clear from Figs. 32 and 61, where nearly the whole load is balanced on the axle of a high, massive wheel with broad tire. A shoulder band from the handles of the barrow relieves the strain on the hands and, when the load or the road is heavy, men or animals may aid in drawing, or even, when the wind is favorable, it is not unusual to hoist a sail to gain propelling power. It is only in northern China, and then in the more level portions, where there are few or no canals, that carts have been extensively used, but are more difficult to manage on bad roads. Most of the heavy carts, especially those in Manchuria, seen in Fig. 203, have the wheels framed rigidly to the axle which revolves with them, the bearing being in the bed of the cart. But new carts of modern type are being introduced.
In the extent of development and utilization of inland waterways no people have approached the Chinese. In the matter of land transportation they have clearly followed the line of least resistance for individual initiative, so characteristic of industrial China.
There are Government courier or postal roads which connect Peking with the most distant parts of the Empire, some twenty-one being usually enumerated. These, as far as practicable, take the shortest course, are often cut into the mountain sides and even pass through tunnels. In the plains regions these roads may be sixty to seventy-five feet wide, paved and occasionally bordered by rows of trees. In some cases, too, signal towers are erected at intervals of three miles and there are inns along the way, relay posts and stations for soldiers.
We have spoken of planting grain in rows and in hills in the row. In Fig. 130 is a field with the rows planted in pairs, the members being 16 inches apart, and together occupying 30 inches. The space between each pair is also 30 inches, making five feet in all. This makes frequent hoeing practicable, which is begun early in the spring and is
