PERSONAL AND CIVIC HYGIENE 325 



well as Porto Rico and the Philippines, contract a certain 

 disease. What ? 



8. Locate any public places where there is much spitting 

 on the floors or walks. Is the place uncleanly in other 

 respects ? Are there flies about ? 



9. Locate any stores exposing any foods especially fruits 

 and vegetables for sale, so that dust and flies may readily 

 come in contact with them. Are these foods also handled by 

 those who are marketing ? 



10. Locate any public fountains with drinking cups. 



11. Locate any railroads. Note. Any railroads using the or- 

 dinary means of disposing of excreta become like open sewers or 

 worse. Why ? All such excreta should be collected in retain- 

 ing vessels and disposed of at various stations along the route. 



12. Locate any excessively dusty streets. Also any that 

 are unduly shady or continually damp. 



Note. The work of the above tabulation may be most 

 profitably done by dividing it among different members of 

 classes, especially if the district studied is very large, or 

 populous. 



Conclusions. 1. Does there seem to be any connection 

 between the sanitary condition of the district and the number 

 and kind of diseases found? 



2. Can you suggest any improvements and give your reasons 

 for them ? 



3. Try to plot a curve showing variations in the death 

 rate due to any of the diseases you have located on the map. 

 Get the data for twelve months from the local or state health 

 department. Try to sum up all the different factors concerned 

 and see if you can account for any variations shown during 

 the year. 



(See next section for instructions for plotting curves.) 



III. INFANT MORTALITY CURVE 



Method a. Let the alternate vertical lines of a sheet of 

 cross-section paper represent the months of the year in order. 



