"Mr. Heath, of Newcastle, surgeon: 'More than usually liable to asthma; mostly between thirty and forty years of age. A person always working in the broken would be more liable to asthma. Asthma is of very slow growth, and it is difficult to say when it begins. Custom and habit will not diminish the evil effects, but will diminish the sensibility to these evils.'—Ibid. No. 497, p. 665, 1. 10-14. "Matthew Blackburn, driver, fifteen years of age, Heaton Colliery: 'Has felt shortness of breath. Helps up sometimes, but is bound to drive. Cannot help up sometimes for shortness of breath. His legs often work, (ache;) his shoulders work sometimes. Working in a wet place.'—Ibid. No. 27, p. 573, 1. 34. "Dr. S. Scott Alison, East Lothian: 'Between the twentieth and thirtieth year the colliers decline in bodily vigour, and become more and more spare; the difficulty of breathing progresses, and they find themselves very desirous of some remission from their labour. This period is fruitful in acute diseases, such as fever, inflammation of the lungs, pleura, and many other ailments, the product of over-exertion, exposure to cold and wet, violence, insufficient clothing, intemperance, and foul air. For the first few years chronic bronchitis is usually found alone, and unaccompanied by disease of the body or lungs. The patient suffers more or less difficulty of breathing, which is affected by changes of the weather, and by variations in the weight of the atmosphere. He coughs frequently, and the expectoration is composed, for the most part, of white frothy and yellowish mucous fluid, occasionally containing blackish particles of carbon, the result of the combustion of the lamp, and also of minute coal-dust. At first, and indeed for several years, the patient, for the most part, does not suffer much in his general health, eating heartily, and retaining his muscular strength in consequence. The disease is rarely, if ever, entirely cured; and if the collier be not carried off by some other lesion in the mean time, this disease ultimately deprives him of life by a slow and lingering process. The difficulty of breathing becomes more or less permanent, the expectoration becomes very abundant, effusions of water take place in the chest, the feet swell, and the urine is secreted in small quantity; the general health gradually breaks up, and the patient, after reaching premature old age, slips into the grave at a comparatively early period, with perfect willingness on his part, and no surprise on that of his family and friends.'—_Franks, Evidence_, App. pt. i. p. 412, 415, Appendix A.