With such an educated class of workmen, the obtainment of a place and the wages of an adult must be the necessary preliminary to a marriage, and unless such place or wages were obtained, the young workman would either remain single or seek employment further a-field. But we will suppose, for illustration, that a casualty occurs, such as the last death on the list, J. M., where a young miner who has married and has a wife and two children is prematurely swept away by an epidemic at 21 years of age, leaving a widow and two destitute orphan children dependent on poor relations, or on the ratepayers. The first mentioned, say S. H., then takes the vacant place of work, marries, and is killed at 34 years of age by “an accident in the mine,” leaving a widow and seven orphan children. This third vacancy in the place of work is occupied by another miner H. Y., who marries and works until he is 45, when he is killed by “consumption,” leaving a widow and five children. Such casualties do not of course actually so fall on any one place of work, but the vacancies so created in different places at the younger periods of life must be and are supplied by new hands coming into the employment, and marrying as a consequence of that employment, and the succession will fairly represent 1 he mode in which the vacancies created by the various causes of death displayed in the last table and in the other tables of the causes of premature widowhood and orphanage occur. In works where the average period of working ability is extended to the natural period of superannuation, which the evidence shows that a combination of internal and external sanitary measures maybe expected to give, namely an average of full 60 years, the account for one place would be one superannuated workman and one widow, and a family of four or five well-grown children, who, having received parental care during that period, will probably all have obtained, before its termination, the means of independent self-support. Whereas with a population of only 15 or 20 years of working ability, the same place of work may during the same period have been filled by two generations and one-fourth of workpeople, not one of which has brought all the children dependent on it to maturity or a condition for self-support; and the account of widowhood and orphanage will frequently for the same place of work stand thus:— Workmen prematurely Dead. Orphan Children. Years’ loss of Support. J. M. 1 widow 2 39 S. H. 1 widow 7 26 H. Y. 1 widow 5 15