HEALTH AND SANITATION 61 



7. It has been authoritatively estimated that a farm hand 

 infected with the hookworm disease is on an average 50% 

 less efficient in his work than the well man. Estimate the 

 loss to a county having 28,500 farmers and hired hands, 

 each man working an average of 290 da. a year at $1 

 per day, if 11% of the men are infected with the disease. 

 To cure each man will not cost on an average over 70$. 

 Estimate the saving in 1 yr. from the labor of these men 

 by curing them. 



8. It has been conservatively estimated that, on an aver- 

 age, it takes the child who attends school in a house improp- 

 erly heated, lighted, and ventilated 20% longer to complete 

 the common-school course of 8 grades of 8 mo. each than 

 when attending school in a house that is sanitary and com- 

 fortable in all its appointments. How much time does each 

 child lose in completing a common-school education when 

 compelled to attend school in an unsanitary and uncomfort- 

 able house ? 



9. In rural communities 400,000 persons die annually, 

 and about 2,000,000 others are seriously ill from infectious 

 diseases. If only 50% of these deaths and cases of sickness 

 can be eliminated by normal schools and teachers 7 colleges 

 in giving rural teachers special courses in the first princi- 

 ples of sanitary science and public health, what would be 

 the annual value of such training to the rural communities 

 of the United States, if a human life is rated at f 1000 (the 

 price of a slave) and each case of prevented sickness at $75 ? 



