374 THE EXCRETIONS: 



rally speaking, choleate of soda (or bile) may be expected to be 

 absent when the faeces have remained for some time in the 

 large intestine, and there has been full opportunity for re- 

 sorption. 



It follows that the carbonate of lime is a product of the 

 double decomposition that occurs between the sulphate of lime 

 and the carbonate of soda resulting from the incinerated cho- 

 leate of soda, or bile. 



The formation of the membrane during evaporation indicates 

 the presence of a certain amount of albumen. 



In 100 parts of the ash yielded by the excrement of another 

 individual, there were contained : 



Chloride of sodium and alkaline sulphates 1*367 i , , , . 



Uoluble in water. 



Bibasic phosphate of soda 



Phosphates of lime and magnesia 



Phosphate of iron . . - ~.,~ , 



... . _ ^insoluble m water. 



Sulphate of lime 



Silica .... 



98-932 



From the absence of carbonate of lime in this instance, it 

 may be concluded that no choleate of soda or bile was present. 

 The excrement was very firm and solid. 



I am indebted to the kindness of Dr. Percy for the follow- 

 ing analyses of the faeces. 



1. The individual, who was about thirty years of age, had 

 taken the ordinary diet of this country, and appeared to be in 

 the enjoyment of perfect health. 



In 100 parts of dried residue there were contained : 



Substances soluble in ether (brownish yellow fat) . 11 '9 5 



in alcohol of -830 . . 10-74 



,, in water (brown resinoid matter) . 11-61 



Organic matter insoluble in the above menstrua . 49-33 



Salts soluble in water . . . . 4-76 



Salts insoluble in water .... 11-61 



An ultimate analysis of the faeces in this case was also insti- 

 tuted. " I may here premise/' says Dr. Percy, " that I have 

 invariably used chromate of lead as the oxidising body, and 

 have occasionally sheathed the combustion tube with thin sheet 

 copper, in order to enable me to attain a high degree of heat 



