. The American journal of tropical medicine. ain experimentalevidence is badly needed. Graphs 8 and 9 illustrate the effects of both sanitation andtreatment. It is postulated in these graphs that, as is practicallythe universal experience, there will be a partial resumption ofsoil pollution after the completion of the sanitary 8 shows that a combination of successful treatment andsanitation will greatly reduce human infestation and soil since the reduction of soil infestation will lag behind for aperiod, depending on the length of life of the infective hookwormlarv
. The American journal of tropical medicine. ain experimentalevidence is badly needed. Graphs 8 and 9 illustrate the effects of both sanitation andtreatment. It is postulated in these graphs that, as is practicallythe universal experience, there will be a partial resumption ofsoil pollution after the completion of the sanitary 8 shows that a combination of successful treatment andsanitation will greatly reduce human infestation and soil since the reduction of soil infestation will lag behind for aperiod, depending on the length of life of the infective hookwormlarvae in the soil, there will be a period of reinfestation. Thiswill shghtly increase the human infestation and if any appreciabledegree of soil pollution is resumed after the conclusion of thecontrol campaign, will also increase the soil infestation. Bothhuman infestation and soil infestation will then slowly increaseuntil a balance is reached, the amount of increase in human 458 WILLIAM W. CORT Graph 6 Effect o[ a sinqle sepies of t?eatmenl3. GTaphT Effect of pepeated sepies cf trealmerits
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttropica, bookyear1921
