ADAMS' METHOD. 117 



adopted at a General Meeting of the Society, and it thus became 

 a quasi-official method. The use of this method for determining 

 total solids was abandoned. 



Notwithstanding the recommendation of the Milk Committee 

 that the coils should be extracted previously to use, it became 

 the general practice to omit this, and to use unextracted coils, 

 making a deduction, -from the weight of total extract, of the 

 weight of the extract obtained from a coil when extracted alone 

 for the same length of time. 



Fig. 11. Soxhlet Extractor. 



The author showed that this last modification was not free 

 from error ; the matter soluble in ether was found to consist 

 chiefly of a calcium salt of resinous acids, which was only of 

 limited solubility in ether ; the acids themselves were much 

 more soluble, and when these were liberated by acids even the 

 small amount of acid found in milk a greater extract was 

 obtained in a given time. As the time usually allowed for 



