APPENDIX B 



261 



- 2500 



Figure 29. Monthly Deaths in Chicago, 1911 to 1915 



When the mean mortality rates had thus been computed for all the 

 combinations of temperature and humidity that occur in a given region, 

 the departures of these rates from the normal mortality were plotted 

 in diagrams like Figure 30. In order to avoid irregularities, however, 

 the departures in Figure 30 and in all the similar diagrams have been 

 smoothed by averaging the departure for any given position on the 



