In the industrial regions of northern France cattle are stall-fed with the waste products of the beet-sugar factories, oil-works and distilleries.
The protoplasm derives its food from substances in solution in the water; the various waste products which are incident to its life are excreted into it, and so removed from the sphere of its activity.
Trautenau is the centre of the Bohemian linen industry and has factories for the manufacture of paper and for the utilization of the waste products of the other mills.
The labouring man's pig is his bank, and is fed on scraps, small potatoes and waste products.
Elimination of waste-products is one of the most important points in regard to health, and when this is interfered with by disease of the kidneys, the life of the patient is rendered more or less uncertain and the health frequently seriously impaired.