57 



Fnt (It ttrntinationx, drying with carbon dioxid. 



It is evident that when dried in carbon dioxid the flour does not undergo any 

 oxidation, while t>..m these results the point seems almost, if not completely, proven 

 that it does undergo oxidation when dried in the open air, and for this reason it is 

 hard to obtain results that check. 



Numerous determinations have been made by this method and it has given perfect 

 sati-t'action as well as being extremely rapid. Time may be saved, as the gooch 

 crueihle d<M not need a new pad every time, the same one being used for at least 

 liti. -n determination- by .-imply knocking out the extracted flour when through. 

 Further, the lla.-k r.mtainiui; the fat may he used six or eight times without cleaning, 

 where a number of determinati"ti- are b.-in^ made. 



This work was carried out with ether as the solvent, but chloroform, acetone, or 

 ben/m may a ho be u-ed, .-imilar r.-uh- heinu; obtained. The following results were 

 obtained: 



'imt by the new method, using different solvents. 



These results become of value on aeeount of the cost, chloroform and ben/in being 

 much cheaper than ether or aeet.-n.- 



In some cases feed and foodstuffs are not well ground, nor capable of being ground 

 as fine as flour. These of course would not extract by the above method readily, but 

 may be extracted by means of the Soxhlet apparatus instead of the gooch crucible. 

 Th- So\hlei apparatus was used on flours and the results check those made with the 



U r h enicible very closely. 



I'.ither one ,,f th,- -oU.-nte named may be used instead of ether, as a larger amount 

 nt i- required under such conditions, and unless special precautions are taken 

 I.KSS may take place. 



( omparison of results on fat, using a gooch and the Soxhlet apparatus. 



