The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . It would be a mistake, however, to consider that theparallelism between the various densities of population andincrease of death-rate observed in Glasgow forms a basis foran infallible generalization that would be applicable to theentire population of all countries ; for in a census of 28 largetowns in England and in Wales (ending Januaiy i, 1897) itwas impossible to detect such constancy between density of THE CAUSATION OF DISEASE. 43 population and death-rate, though the communities st
The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . It would be a mistake, however, to consider that theparallelism between the various densities of population andincrease of death-rate observed in Glasgow forms a basis foran infallible generalization that would be applicable to theentire population of all countries ; for in a census of 28 largetowns in England and in Wales (ending Januaiy i, 1897) itwas impossible to detect such constancy between density of THE CAUSATION OF DISEASE. 43 population and death-rate, though the communities studiedwere embraced between the extremes represented by Hud-dersfield, with a population of 90,034, a density of personsper acre, a birth-rate of , and a death-rate of from per 1000, and Liverpool, with a population of 592,991, adensity of persons per acre, a birth-rate of , and adeath-rate of from to per 1000. Chart i.—Showing incidence of certain classes of diseases amongoccupants of various size houses {^Russell).. a b c a. One and two room nouses; b, three and four room houses; c, five roomsand upward; (i) zymotic diseases; (2) nervous and other diseases special tochildren; (3) accidents and syphihs in children; (4) diseases of the lungs; {5)miscellaneous diseases. Similarly in the United States ^ we find the density ofpopulation, as expressed by persons per acre, to bear no con-stant relation to the death-rates in 50 large cities in thiscountry, from which the statistics were compiled. The data 1 See Eleventh Census of the United States, volume on Social Statistics ofCities. Diagram 3, pp. 8 to 12. 44 HYGIENE OF TRANSMISSIBLE DISEASES. referred to were embraced between the extremes representedby New York cit}, with 58 persons per acre and a death-rateof per 1000 of population, and Fall River, Mass., with 4persons per acre and a death-rate of per looo of popu-lation. Though a diminution in the number of persons peracre fr
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