Such entries of numerals and letters will in general suffice for the intended purpose; but the surgeon may, of course, find it desirable to make other notes for his own information, and it is within his discretion to supply further details to occupiers or workers concerned. REFERENCES. [1], [2] S. KING ALCOCK, B. M. BOND, A. SCOTT and others, in discussion on the Value of Systematic Examination of Workers in Dangerous Trades. Brit. Med. Journ., vol. ii., pp. 741-749, 1902. [3] KING ALCOCK: The Early Diagnosis of Industrial Lead Poisoning. Paper contributed to the Second International Congress for the Study of Industrial Diseases held at Brussels, 1910. CHAPTER XIV PREVENTIVE MEASURES AGAINST LEAD POISONING--_Continued_ =Overalls and Head Coverings.=--Stress has been laid on the wearing of overalls and head coverings in processes giving rise to dust or to splashes of glaze or paint in special rules and regulations in the past. With the improvement that has taken place in exhaust ventilation, they have become less important. Indeed, the aim of all manufacturers and ventilating engineers should be to render processes so free of dust as to make them altogether unnecessary. Increasing knowledge of the insidious manner in which lead dust can arise has shown that from this point of view overalls of the cotton or linen material ordinarily worn constitute a real source of danger. Splashes of glaze dry on them, and at every movement involving rubbing of the surface dust is generated. Some operations almost oblige the worker to press the article worked upon against the chest, so that chance of inhalation of dust from this source alone is considerable. Taking them off creates dust, and after this is done a reprehensible practice exists of either shaking or beating them against a post. In large factories they are usually washed on the premises, and the water in which this is done will become a solution containing some lead in suspension. Hence, even when washed and dried ready for wear, overalls may not be quite free of lead. Apart from the general obligation recognized that an employer should provide and maintain everything necessary to guard against danger contracted in his factory, we think that the risk run by a worker in taking the overall home and washing it there is negligible, and offers advantages in the ultimate cleanliness of the overall over washing on factory premises. Laundresses shaking overalls prior to washing them have been known to contract plumbism. Where work with the arms is incessant, as in the heading of yarn, overalls are burdensome, and for this reason and the fact that with efficient exhaust ventilation there should be practically no dangerous dust, the regulations for the heading of yarn enjoin provision of them only on written certificate of the Chief Inspector of Factories.