37 



w: This collaborator states that through a misunderstanding the po-- 

 tiona taken f,,r analysis were weighed out after drying the materials in a desiccator 

 For this reason the pen-entases of alcohol extract and nonvolatile ether extract are not 

 comparable with thus.- -riven ly the other analysts and are not given in the table 



/>. Wood* The ether extract in the determinations made by the method 

 ribed not being complete, <>tlu>r trials were made, using different quantities of the 

 material and extracting for longer periods. The results are given in the following 

 table: 



fjnare 



tammies adulterated with olive oil, varying weight of sample 

 and time of extraction 



PURE PAPRIKA. 



PAPKIK \ ADULTERATED WITH ol.lVKOIL 



unn-nis on the above result.- as full, 



I ii ' >>little au<l < >_rden rej><>rt a much higher iodin number than any of my 



re.-ult.- would Indicate and alaothaJ toeirreaulta are very concordant. \\ithdirections 



'u 1 tail to see how one could place any reliance on the results of this determi- 



Q. ltma\ that by niMninu'theetherextractinuforanexactdefinite time 



re>ul; 'dtained agreeing reasonably close with each other, but I doubt this 



A hat, t->r it ha- been OUT experience that some detenu hint ions extract much faster 



than oth.-r-. .l.-|M'iulitr on the rate of flow of the ether and the type of extractor used, 



and that until the extraction is complete there is no surety that two determinations 



will a-jree at any -jiveii time durini; the process. 



The-e i'e\\ Jet ( -rn i i nat ions -eein to indicate that if the iodin number is made on the 

 complete ethei 'her material besides fat ^resins, etc.) will so increase the 



wei-lit that the value of the iodin number will be reduced, while, if the determination 

 i> made before the extra tion is complete, the result scan not be depended on to agree. 



rrinton comments on hi.- results as follows: 



The iodin number- 0:1 (tie nonvolatile ether of the samples prepared with oil did not 

 and lam reporting only the average of results obtained. I was very much sur- 



i to lind the iodin number of the nonvolatile ether extract in the pure sample so 

 much lower by the m.-thod you suggest than that obtained by the method used by 

 loolittle, but i lii- i- easily accounted for, because a long extraction with ether carries 

 other material which i- not readily soluble in ether and would not be found in the 

 ether extract when u shorter extraction time is used. From theresults obtained bythis 

 method 1 do not think that it would be advisable to use an official ether extract for the 



.iiination of the iodin number, as by so doing we are liable to overlook samples 

 prepared with olive oil, the presence of which would be revealed by using Doolittle's 

 method. 



