According to the standard first described we find as is shown in Table VI that families with three, four and five individuals sleeping in a single room show a progressive increase of incidence over those families with but one or two per bedroom. This again is shown best in the total for all families, but is borne out in a study of each district. These statistics are however of little value for the study of the effect of overcrowding, because crowded families are usually large families. With an influenza incidence of 20 per cent. we would theoretically expect every family of five or larger to have one or more cases. This would amount to 100 per cent. infected families and such a state would not only influence, but dominate the statistics regarding overcrowding. TABLE V. _Effect of crowding on development of influenza in families._ (A higher proportion of crowded households than roomy are invaded). (Standard used: ratio of number individuals to number rooms). ══════════════╤══════════╤═════════════════════════════════════════════ Living │ No. of │ Proportion of these families visited by conditions. │ such │ influenza. │families. │ ──────────────┼──────────┼──────────┬──────────┬────────────┬────────── │ │ In │ │ In both │ Total „ │ „ │ 1918–19. │ In 1920. │ epidemics │ families │ │ │ │(Recurrent).│ invaded. ──────────────┼──────────┼────┬─────┼────┬─────┼─────┬──────┼────┬───── „ │ „ │No. │ Per │No. │ Per │ No. │ Per │No. │ Per │ │ │cent.│ │cent.│ │cent. │ │cent. ──────────────┼──────────┼────┼─────┼────┼─────┼─────┼──────┼────┼───── District I. │ │ │ │ │ │ │ │ │ V. Cr. │ 53│ 30│56.61│ 15│28.31│ 12│ 22.64│ 31│58.49 Cr. │ 195│ 107│54.87│ 59│30.26│ 43│ 22.05│ 123│63.08 R. │ 79│ 36│45.57│ 24│30.38│ 18│ 22.78│ 42│53.16 V. R. │ 16│ 7│43.75│ 1│ 6.6│ 0│ 0.0│ 8│50.00 ──────────────┼──────────┼────┼─────┼────┼─────┼─────┼──────┼────┼───── District II. │ │ │ │ │ │ │ │ │ V. Cr. │ 4│ 1│25.00│ 1│25.00│ 1│ 25.00│ 1│25.00 Cr. │ 137│ 70│51.09│ 31│22.63│ 2│ 8.76│ 89│64.96 R. │ 208│ 70│33.65│ 39│18.75│ 7│ 8.17│ 92│44.23 V. R. │ 103│ 20│19.42│ 7│ 6.80│ 2│ 1.94│ 25│24.27 ──────────────┼──────────┼────┼─────┼────┼─────┼─────┼──────┼────┼───── District III. │ │ │ │ │ │ │ │ │ V. Cr. │ 13│ 9│69.23│ 2│15.38│ 1│ 7.69│ 10│76.92 Cr. │ 213│ 99│46.48│ 65│30.52│ 40│ 18.78│ 124│58.22 R. │ 143│ 62│43.36│ 35│24.48│ 15│ 10.49│ 82│57.34 V. R.