35 



In the preparation of these extract.-, ordinary rectified alcohol is, of course, used. 

 Such alcohol always contains more or less acetaldehyde. Any general reagent for 

 aldehyde-, like furh.-in, therefore tends to give too high results for citral because of 

 ill.- reaction on the acetaldehyde present. 



Second. 1' is unnecessary, as stated, to use especially purified alcohol free from 

 aldehydes. 



Third. All the operations may be carried on at room temperature. 



Tin- following fk'' ubmitted on the official samples: No. 1, 0.251; No. 2, 



- 117: No. 1. o.o.il. 



1 and '2 an- somewhat below the average figures submitted by the collaborators. 

 Nos. 3 and \ an- much do.-er to the actual amount present than those obtained by Mr. 

 ililtncr with the method under trial. As the method was called to the referee's 

 aiirntii.n "nly a few day.- l>cf.>re the meet inn. no opportunity was offered to test it 

 this year. 



GENKKAI. Disrrssiox OK RESULTS. 



The rr-nli- obtained <m the official -a in pies as a whole exceed greatly the expecta- 

 tion- of the 



When twelve dnteivni aiialv-i- an- working even with a well-established method 

 under vary in:: condition-, experience has shown that some discordant results are apt 



to 1 b tained. When like di -en- pane ie- have been obtained with the official methods 



for nitrogen and pota-h. it \\ould.-een-. that the results, in the present case, are highly 

 .-at i Mac lory. 



It appears to be of no advantage to remove the color before making the determina- 

 tions in fact, .-everal of the collaborator- are of the opinion that it renders the solutions 

 harder to n-ad. The \\oik done ai \Va.-hinu r tn also indicated that there was little 

 advantage to be obtained, certainly not .-nilicimt to offset the loss of citral. The results 

 -IL'hily l.eiii-i on the alcoholic -..Intions of citral than upon the extracts. They 

 brttrr on the terpenel.-s extract than on the extract containing lemon oil. 

 Thi- i-. in all probability, due to the effect o! the non-aldehydic constituents upon the 

 of the inch-in .-olntion. Where the colors are not of like tint, considerable 



i'lirrd in order to correctly match them. 



On the tmal comparison- the standard ami sample must contain approximately equal 

 amoun r lo percent i- not allowable. 



The method i- not dilhrnlt of manipulation, but does require pure reagents, espe- 

 cially in the case of aldehyde-free alcohol. It is highly probable that the greater part 

 of the discordant result.- are due to the latter, (liven a cologne spirit of good quality, 

 there Been er, to be m> reason why good results should not be obtained. It is 



miended that the method as submitted for the determination of citral in lemon 

 adopted provi-ionally by the association. 



REPORT ON SPICES. 



I'.y A. I.. WIVION. A.x.xiH-liitt' Referee. 



The atlention of the associate referee was directed to the adulteration of paprika 

 with olive oil, and the methods >f detecting this form of adulteration, by papers pre- 

 d by Doolittle and Ogden and by Loewenstein at the New Haven meeting of the 

 American Chemical Society. Although the time was short for giving this matter suit- 

 able attention, a circular letter was sent out on September 5 to such chemists as had 

 previously expressed a willingness to cooperate, and later, samples of two kinds of 

 paprika were distributed, one purporting to be pure, the other adulterated with olive 



oil. 



