I have appended the copy of a map of Bethnal Green, made with the view of showing the proportions in which the mortality from epidemic diseases and diseases affected by localities, fell on different classes of tenements during the same year. The localities in which the marks of death (×) are most crowded are the poorest and the worst of the district; where the marks are few and widely spread, the houses and streets, and the whole condition of the population, is better. By the inspection of a map of Leeds, which Mr. Baker has prepared at my request, to show the localities of epidemic diseases, it will be perceived that they similarly fall on the uncleansed and close streets and wards occupied by the labouring classes; and that the track of the cholera is nearly identical with the tract of fever. It will also be observed that in the badly cleansed and badly drained wards to the right of the map, the proportional mortality is nearly double that which prevails in the better conditioned districts to the left. To obtain the means of judging of the references to the localities in the sanitary returns from Aberdeen, the reporters were requested to mark on a map the places where the disease fell, and to distinguish with a deeper tint those places on which it fell with the greatest intensity. They were also requested to distinguish by different colours the streets inhabited by the higher, middle, and lower classes of society. They returned a map so marked as to disease, but stated that it had been thought unnecessary to distinguish the streets inhabited by the different orders of society, as that was done with sufficient accuracy by the different tints representing the degrees of intensity of the prevalence of fever. In the Whitechapel union, in which the special investigation which led to the inquiry into the sanitary condition of the metropolis was first directed, the numbers were as follows in the year 1838:— No. of WHITECHAPEL UNION. Average Deaths. Age of Deceased. 37 Gentlemen and persons engaged in professions, and their families 45 years. 387 Tradesmen and their families 27 1,762 Mechanics, servants, and labourers, and their families 22 To judge of the comparative mortality amongst the average of a town population, I obtained the following returns; the one from the clerk of the Strand union, the other from the clerk of the Kensington union:— No. of STRAND UNION. Average Deaths. Age of Deceased.