SULPHUROUS ACID AND SULPHITES. 841 



and as is seen, such is not the case, but the increase of neutral sul- 

 phur shows an increase of unoxidized sulphur from some source. 



The data for No. 2, as given in Table XI, agree very closely with 

 those discussed for No. 1. One notable exception is the decrease in 

 this case of the percentage amount of neutral sulphur during the 

 preservative period, though there is an increase in actual amount of 

 63 milligrams of neutral sulphur, as SO 3 . The ethereal sulphates in 

 this instance are again constant, ranging from 213 milligrams of sul- 

 phur as SO 3 in the fore period to 216 milligrams during the preserva- 

 tive period and 205 milligrams during the after period. The ratio of 

 ethereal sulphates to the inorganic varies from 1:11.2 in the fore 

 period to 1:13.4 in the preservative period, and 1:11.3 in the after 

 period. As in the case of No. 1, the greatest increase of sulphur is in 

 the form of inorganic sulphates. 



In the case of No. 3 there is an increase in total sulphur, sulphates, 

 and neutral sulphur, and also a notable increase in the ethereal sul- 

 phates during the preservative period. The percentage amount of 

 neutral sulphur and inorganic sulphates is slightly increased during 

 the preservative period, while "the total sulphates show a slight 

 decrease in percentage amount and the ethereal sulphates a consider- 

 able decrease during the preservative period. The ratio of the ethereal 

 sulphates to the inorganic varies from 1:11.7 in the fore period to 

 1:14.0 in the preservative period, and 1: 11.9 in the after period. 



With one exception the data for No. 4 agree with those of No. 1 in 

 every respect. The percentage of inorganic sulphates of the total 

 sulphur excreted shows an increase of 0.8 per cent in the preservative 

 period, while there is a decrease in the case of No. 1. There is a con- 

 tinued decrease in the after period in both instances. The ratio of the 

 ethereal sulphates to the inorganic is 1 : 15 in the fore period, 1 : 19.5 

 in the preservative period, and 1 : 17.4 in the after period. 



In the case of No. 5 there is an increase in all the sulphur con- 

 stituents during the preservative period, with a decrease in the after 

 period to a less amount than is shown in the fore period. The per- 

 centage amounts of these substances remain practically the same in 

 the preservative period as in the fore period. The neutral sulphur 

 and inorganic sulphates show a decrease in the after period over the 

 fore period, while the total ethereal sulphates show an increase. The 

 average ratio of the ethereal sulphates to the inorganic is 1 : 16.9, 

 1 : 17.2, and 1 : 12.7 for the three periods respectively. 



No. 6 shows an increase of neutral sulphur throughout the obser- 

 vation, while in the case of the ethereal sulphates there is an increase 

 during the preservative period, returning, however, in the after 

 period to the same amount as in the fore period. The chief increase, 

 as in the previous subjects, was in the amount of inorganic sulphates. 

 The ratio of ethereal sulphates to the inorganic is 1 : 14.3 in the fore 



