218 INFLUENCE OF FOOD PRESERVATIVES ON HEALTH. 



period the percentage eliminated falls to 84.3. This number is evi- 

 dently below the normal, showing- an attempt on the part of the body 

 to restore a portion of the loss produced by the previous preservative 

 period. / 



The data in this series as a whole show the same results as in Series 

 1. The variations, however, in the case of the first and second sub- 

 periods should be noted. 



The average data given are calculated only for those members of 

 the class who completed the whole series. The data for the other 

 members are given in the table, but not utilized in the general average 

 for comparison. 



SERIES IV. 



In this series the data were greatly disturbed by the illness of a 

 number of the members of the class. The reports for Nos. 8, 9, and 10 

 are the only ones that are complete for the whole period. The average 

 daily percentage of elimination during the fore period in the case of 

 Nos. 8, 9, and 10 is 94.7. This rises to 95.1 in the first preservative 

 subperiod, falls to 90.8 in the second subperiod, and rises again to 

 93.2 in the third subperiod. The mean for the three subperiods is 

 93, which is slightly less than the average percentage eliminated dur- 

 ing the fore period. During the fourth subperiod the average per- 

 centage excreted is 87.1, and for the four subperiods together 91.4. 

 During the after period the average percentage excreted rises to 95.1. 



The general results of these data are contradictory to the other 

 series. It must be borne in mind, however, that both Nos. 8 and 9 

 had suffered very seriously from the grippe during the period of the 

 second series, when they were not under observation at all, and there- 

 fore no comparison can be made with any previous record for these 

 two. In other words, the data of this series must be regarded not 

 only as imperfect, as is shown by the table itself, but also in some 

 respects as abnormal. They are given, however, in full, in order that 

 no fact connected with the observation which bears at all upon the 

 interpretation of the results may be omitted from the tabulation. 



Nos. 11 and 12, who had a late start on account of illness, may be 

 studied together. The mean percentage eliminated during the fore 

 period in these cases is 101.1, during the preservative period 95.1, 

 and during the after period 93.6. These data must be interpreted 

 from the point of view that both subjects had been ill immediately 

 preceding the experiment. 



SERIES V. 



In this series No. 4 left the city on May 25, and the data in this 

 case are incomplete. No. 6 received no preservative after June 12 and 

 No. 2 after June 11, both by reason of illness. 



Let us first consider the three subjects, namely, Nos. 1, 3, and 5, 



