After leaving the plains country the railway traversed a narrow winding valley less than a mile wide, with gradient so steep that our train was divided. Fully sixty per cent of the hill slopes were cultivated nearly to the summit and yet rising apparently more than one in three to five feet, and the uncultivated slopes were closely wooded with young trees, few more than twenty to thirty feet high, but in blocks evidently of different ages. Beyond the pass many of the cultivated slopes have walled terraces. We crossed a large stream where railway ties were being rafted down the river. Just beyond this river the train was again divided to ascend a gradient of one in thirty, reaching the summit by five times switching back, and matched on the other side of the pass by a down grade of one in forty. At many of the farm houses in the narrow valleys along the way large rectangular, flat topped compost piles were passed, thirty to forty inches high and twenty, thirty, forty and even in one case as much as sixty feet square on the ground. More and more it became evident that these mountain and hill lands were originally heavily wooded and that the new growth springs up quickly, developing rapidly. It was clear also that the custom of cutting over these wooded areas at frequent intervals is very old, not always in the same stage of growth but usually when the trees are quite small. Considerable quantities of cordwood were piled at the stations along the railway and were being loaded on the cars. This was always either round wood or sticks split but once; and much charcoal, made mostly from round wood or sticks split but once, was being shipped in sacks shaped like those used for rice, seen in Fig. 180. Some strips of the forest growth had been allowed to stand undisturbed apparently for twenty or more years, but most areas have been cut at more frequent intervals, often apparently once in three to five, or perhaps ten, years. At several places on the rapid streams crossed, prototypes of the modern turbine water-wheel were installed, doing duty grinding beans or grain. As with native machinery everywhere in China, these wheels were reduced to the lowest terms and the principle put to work almost unclothed. These turbines were of the downward discharge type, much resembling our modern windmills, ten to sixteen feet in diameter, set horizontally on a vertical axis rising through the floor of the mill, with the vanes surrounded by a rim, the water dropping through the wheel, reacting when reflected from the obliquely set vanes. American engineers and mechanics would pronounce these very crude, primitive and inefficient. A truer view would regard them as examples of a masterful grasp of principle by some, man who long ago saw the unused energy of the stream and succeeded thus in turning it to account.