We find, _e. g._, that in the tropical districts the miasmatic class of diseases occasions a large proportion of the mortality, _e. g._, at Sierra Leone 20·4 per cent. of the total mortality among males and 6·8 per cent. of that among females is due to small-pox; that 34 per cent. of the mortality among females is due to dysentery; and that 19 per cent. of the mortality among males is due to periodic fevers. The mortality from miasmatic disease in this hospital is no less than 43·9 per cent. of the total mortality among men, and 43·1 per cent. of the total mortality among women. [Sidenote: Table K, p. 40.] At Cape Coast Hospital the admissions from miasmatic diseases, at least those recorded, amounted only to 9 1/2 per cent. of the total admissions, and no deaths are attributed to this class of diseases. This is quite sufficient to show the imperfection of the hospital records at this station. [Sidenote: Table U, p. 49.] At Port Louis Hospital, Mauritius, the miasmatic deaths from dysentery, diarrhœa, cholera, continued fevers, and rheumatism amounted to 54·9 per cent. of the total mortality for men, and 47·9 per cent. of the total female mortality. [Sidenote: Table W, p. 51.] Dysentery appears to be particularly severe and fatal amongst the natives in Ceylon, for the returns show that 43·6 per cent. of the men’s mortality and 30·1 per cent. of the women’s were due to this one disease. The miasmatic class generally gave rise in these hospitals to 64·3 per cent. of the total deaths of men, and 60·1 per cent. of those of women. {11} [Sidenote: Table Q, p. 45.] In D’Urban Hospital and Grey’s Hospital, Natal, 41·1 per cent. of the men’s mortality arose from continued fever, and 6 per cent. from dysentery. This latter disease occasioned all the deaths in hospital among women. These two diseases are the only ones of the miasmatic class which proved fatal. [Sidenote: Table O, p. 43.] Miasmatic diseases appear to be rare among the native patients at King William’s Town, Kaffraria. Only one of them, dysentery, produced a fatal result, and it gave rise to no more than 6 per cent. of the total deaths of men and women conjointly. [Sidenote: Table Y, p. 53.] The same diseases appear to be rare also in the Canadian hospitals, where they occasioned 12·3 per cent. of the men’s mortality and 17·3 per cent. of the women’s. The prevailing types were diarrhœa, periodic fevers, and rheumatism. [Sidenote: Table M.] If we take the other points of comparison, supplied by tubercular diseases, we find a remarkable difference in the proportion of mortality in different colonies. Thus, the death rate from scrofula, phthisis, and hæmoptysis, at Free Town, Sierra Leone, amounts to 3·2 per cent. of the total deaths from all causes among men, and 2·3 per cent. among women. In this hospital other chest diseases give rise to a mortality of 2·4 per cent. for men. [Sidenote: Table K.]