3. Married--unmarried female workers; 4. Apprentices--qualified wage-workers; 5. Wage-workers subject to school duties--exempt from school duties, _b._ Having reference to the need of protection arising out of differences in the position occupied by the wage workers in the business: Skilled labourers (such as professional wage-workers, business managers, overseers and foremen; or technical wage-workers, mechanics, chemists, draughtsmen, modellers); unskilled labourers. I. PROTECTION AGAINST EXTERIOR DANGERS. A glance at existing legislation on Labour Protection, or even only at the various paragraphs of the _von Berlepsch_ Industrial Code Amendment Bill, clearly shows the definite significance of all these foregoing classes in the codification of protective right. Each one of these classes is treated both generally and specifically in the Labour Acts. Mining industries, industrial (manufacturing) work, and wage service in trade, traffic, and transport, do not all receive an equal measure of Labour Protection. Differences in the danger of the occupation play a great part in the labour-protective legislation of every country. Labour Protection has therefore hitherto been, and will probably for some time continue to be in effect, protection of factory and quasi-factory labour (I.B. 2, _supra_), but in all probability it will gradually include protection of household industry also. Even the English Factory and Workshop Acts do not, however, extend protection to wage-labour in family industry. Business managers have hitherto received no protection, or a much smaller measure than that extended to common wage-labourers. Furthermore, Labour Protection has hitherto been administered through different channels, according as it is applied to professions of a public nature, in which discipline is necessary, especially the military profession, or to professions of a non-public nature. Lastly, with regard to individual differences of need for labour protection, adult labour has hitherto received only a restricted measure of protection, whereas the labour of women and children has long been fairly adequately dealt with; the prohibition of employment of married women in factory-labour still remains an unsolved problem in the domain of Labour Protection question, but it is a measure that has already received powerful support.