MKTIIODS OF ANALYSIS. 

 TAHI.K \ I I I. /"//// inmtln-i-K <>f rnrinnx oil* nml f<ilx. , 



"Comim-rciul oils. 



''Adulterated with eottnn-seed oil. 



oFour hours for Hiibl determination. 



As will be seen from Table XIV, the length of time involved in the 

 determination is greatly lessened by the use of the Wijs and the Hanus 

 solutions. In case of olive oils the reaction is complete in fifteen 

 minutes; cotton seed, sesame, mustard, and other nondrying and semi- 

 drying- oils require thirt} r minutes; while rape and linseed <>iU n><|iiire 

 one hour for complete absorption. 



