96 



INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



TABLE XII. Average weights of subjects for Series Hand IV. 



a Weighed only on two days. 



ft No weights taken for No. 7. 



c Beginning with the fourth series, No. 9 was replaced with another man. Data calculated back 

 on variations of original No. 9. 



rfNo. ]0 received no preservative in the supplementary series, and his weight should not enter into 

 the average. 



e No. 7 dropped out of experiment on April 1. 



GRAPHIC REPRESENTATION. 



It seems that a better illustration of the actual changes in weight 

 produced during the continuation of the experimental work can be 

 secured graphically. To this end the daily variations have been 

 platted in the accompanying charts (figs. 2-7), and the mean weights 

 for each of the periods of each series have been determined. This has 

 been done for each individual under observation and also for each series 

 of observations as a whole. Finally, the means of all the series have 

 been combined into a general expression representing the means of the 

 entire experiment. The data which have been used in calculating these 

 graphic lines are not exactly the same as those which have just been 

 discussed in connection with the variation in weights. There have 

 been excluded from the graphic illustration all the data which in 

 themselves were not reasonably complete. In each series only those 

 members of the table have been compared whose weights were taken 

 throughout the entire series, including the fore, preservative, and after 

 periods. For this reason the data as a whole for Series II are 

 excluded because in no instance in these cases was there any individual 

 who completed entirely the whole series. In the case of Series I the 

 data are ^complete for all members. In the case of Series III the data 

 are complete for four members only. In the case of Series II the 

 data are not complete for any one person, but the graphic representa- 

 tion of the variations in weight is given for the fore period and the 

 preservative period. These data are, however, not used in any of the 



