It is a sorry but indisputable fact that where children are employed, the most unhealthful work is generally given them.[132] In the spinning and carding rooms of cotton and woollen mills, where large numbers of children are employed, clouds of lint-dust fill the lungs and menace the health. The children have often a distressing cough, caused by the irritation of the throat, and many are hoarse from the same cause. In bottle factories and other branches of glass manufacture, the atmosphere is constantly charged with microscopic particles of glass. In the wood-working industries, such as the manufacture of cheap furniture and wooden boxes, and packing cases, the air is laden with fine sawdust. Children employed in soap and soap-powder factories work, many of them, in clouds of alkaline dust which inflames the eyelids and nostrils. Boys employed in filling boxes of soap-powder work all day long with handkerchiefs tied over their mouths. In the coal-mines the breaker boys breathe air that is heavy and thick with particles of coal, and their lungs become black in consequence. In the manufacture of felt hats, little girls are often employed at the machines which tear the fur from the skins of rabbits and other animals. Recently, I stood and watched a young girl working at such a machine; she wore a newspaper pinned over her head and a handkerchief tied over her mouth. She was white with dust from head to feet, and when she stooped to pick anything from the floor the dust would fall from her paper head-covering in little heaps. About seven feet from the mouth of the machine was a window through which poured thick volumes of dust as it was belched out from the machine. I placed a sheet of paper on the inner sill of the window and in twenty minutes it was covered with a layer of fine dust, half an inch deep. Yet that girl works midway between the window and the machine, in the very centre of the volume of dust, sixty hours a week. These are a few of the occupations in which the dangers arise from the forced inhalation of dust.