ETHER EXTRACT 



149 



for "phosphate" is filtered off, ignited, and weighed 

 as "sand or silicious matter." 



142. {c) Crude Fat or Ether Extract. 



The fat or oil is extracted from 10 grams of the 

 material by the method described in 12, p. 19, with 

 ether or petroleum ether boiling below 50° C. If the 



Fig. 20. — Apparatus for drying substances in a current 

 of inert gas. 



former is used, it must be dry and free from alcohol, 

 and the sample must be dry also. If petroleum is 

 used the absence of moisture is not so essential. 



The dry material from the moisture estimation may 

 be used for the estimation of the oil or fat. 



By this method, unfortunately, not only is the fat extracted 

 but also such substances as waxes, colouring matters, organic 



K 2 



