SERIES VII. 



ADMINISTRATION OF THE PRESERVATIVE. 

 SCHEDULE OF ADMINISTRATION. 



The fore period in Series VII began on February 1, 1904, and the 

 after period closed on Mar.cn 11. The fore period extended over a 

 period of ten days, the preservative period lasted twenty days, and the 

 after period ten days, a total of forty days under observation. The 

 divisions of the periods are shown in Table I. 



TABLE I. Dates of periods and subperiods, Series VII. 



The period extending from December 7, 1903, which marked the 

 close of Series VI on salicylic acid, to February 1, 1904, when the 

 sulphurous acid series was begun, is termed the relaxation period. 

 Inasmuch as the same men served in the two experiments it was 

 deemed advisable to allow this length of time to elapse before entering 

 upon the second test. 



In Table II is given a schedule showing the dates of the admin- 

 istration of the preservative and the amounts given. The salt 

 used for the administration of the sulphurous acid was sodiurq. 

 sulphite, and the quantity of SO 2 contained therein was calculated. 

 About one-fourth of the weight of crystallized sulphite (Na 2 SO 3 7 H 2 O) 

 is composed of sulphurous acid (SO 2 ). From the table it is seen that 

 the quantity of sulphurous acid as sulphites administered during 

 the first preservative subperiod to each man is 1.115 grams and in the 

 form of sulphurous acid gas 0.856 gram. For the second preserva- 

 tive subperiod the quantity given to each man is 2.54 grams as 

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