.*.:.' Mr. A. W. Blyth. Observations on the [May 15, 



determined in the usual way. The methods used for estimating the 

 other constituents were ordinary methods, and need not be detailed. 

 Table IV gives the total excretion of the various substances men- 

 tioned, by the kidney, during each of the six days. 



Excretion of Sulphates and Organic Sulphur. 



As a subsidiary research, the sulphates were precipitated from a 

 measured sample of the urine by barium chloride, and after the 

 precipitate had been separated, the organic sulphur compound was 

 broken up by saturating the liquid with chlorine. By this means, a 

 second precipitate of barium sulphate was thrown down, and in the 

 following table is calculated into organic sulphur. 



Table V. Amount of Sulphur as Sulphates and as Organic Sulphur 

 separated daily, and compared with the Quantities of certain 

 Foods. 



It is possible to arrive at the probable origin of the sulphur both 

 oxidised and unoxidised, by arranging the days of the week in order 

 so that the day of most sulphur excretion is at the top, of least 

 sulphur excretion at the bottom ; and then to take from Table I the 

 several foods, and arranging them in a similar order to see whether 

 there is any coincidence. 



The days in the order of sulphur excretion are Friday, Wednesday, 

 Saturday, Tuesday, Thursday, and Monday. 



Since albumin constantly contains sulphur, the sulphates might 

 be governed by the total albuminoids, but a glance at Table V wil 

 show that the albumin sequence is Thursday, Wednesday, Friday 

 Monday, Tuesday, and Saturday, which has no relationship with tl 

 sulphur sequence. It may be similarly shown that for a like reasoi 

 the liquids, the cabbages, the oatmeal, and all other constituents 

 the bread-stuffs may be excluded. 



The toast, the bread, and the muffins (when taken) for each d 



