328 PERSONAL AND CIVIC HYGIENE 



(The various curves may be represented in different colored 

 pencils, or by differently broken lines, as in Figure 83.) Locate 

 the temperature curve in the same way. However, since the 

 temperature numbers do not run so high, it is wise to allow a 

 large square's distance on the vertical line T, as representing 

 10 degrees. Thus continue to locate as many curves as is 

 desired, taking care not to intermingle so many, however, as 

 to make difficult reading. 



Observation, What months show the highest mean temper- 

 ature ? The greatest prevalence of flies ? The highest death 

 rate under one year ? Five years ? 



Conclusions. 1. What months have the most favorable tem- 

 perature for the development of bacteria in milk ? What extra 

 care should be taken with the milk supply (a) when milking ? 

 (6) when in transit to customer ? (c) when in hands of customer ? 



2. What does the "prevalence of flies" curve show (a) as 

 to comparison with mean temperature ? (b) prevalence of 

 diarrheal diseases ? (c) deaths under one year ? 



3. What special precautions should be observed by all and 

 especially mothers with babies under five years as to (a) milk 

 supply ? (b) food of any description ? (c) presence of flies ? 



4. Tell some of the ways by which you could aid in helping 

 to reduce the terrible mortality of babies during the summer 

 months, especially in the large cities. Note. In 1908, 15,000 

 babies under one year of age died in New York city alone from 

 improper preparation and care of food. 



Method b. Using the above as a model, refer to any mor- 

 tality tables l you may be able to get and plot similar curves 

 and write out any conclusions you may be able to make. Of 

 course the most valuable one for your purposes would be from 

 data furnished by your own local Department of Health. If 

 such cannot be obtained, use those published by your State 

 Department of Health, or of any other city or state. 



1 Such tables as given on p. 33, Bulletin Merchants' Association, New York, 

 " The House Fly at the Bar," are good. Also study the curves plotted in the 

 same bulletin. 



