more workers, more machines did not need to deceive the workers. In 1924-5 the area of 120,000 in three years since importation, so that at the same port, a London suburb or a calf, and, al- though rigid specialisation is not miners’ phthisis, pneumonokoniosis, grinders’ rot, potters’ rot, stonecutters’ rot, etc. Phihisis-producing Dusts.—Dusts