158 THE ALUMNI JOURNAL. 



separatory funnel with ether. The ether The following results have been ob- 



was evaporated oflF (assisted by siphoning tained by this method from the commer- 



the vapor and the use of suction of air), cial samples of powdered cloves and 



The mass on cooling crystallized. These clove oil : 



crystals were dissolved in 15 C.C. alcohol Powd. Cloves. Per cent, of oil. Percent, of Eugenol. 



(90 per cent.), heated to solution and No. i 17.50 59-74- 



. . J " 2 - -_I7 Vi 60.45. 



recrystallized by placing in ice water and ,. x*\\ '' \'^y_\2.']X-. — '.'_ 66.16. 



shaking the flask repeatedly. The solu- 



*, ,,^,.j., 1. Clove oil. Per cent. Eugenol. 



tion was decanted and filtered through a ^ ^, , 



No. I 70 CD. 



small filter from the crystals, and the << 2 --- -78.12. 



latter simply washed with an additional " 3 8.^-45- 



15 Cc. of alcohol (90 per cent.). The Coming to the subject of quantitative 

 crystals in the flask with filter paper were microscopical analysis, while accurate re- 

 dried at 100° C. and weighed. g^^^tg j^ay be possible, so tar only approxi- 



I Gm. eugenol requires .341 Gm. KOH. mate figures have been obtained. 



I Gm. " " .693 Benzoyl eugenol. ^, ^ , -^y ^ ■ ^ . a 



5 C.C. alcohol (90 per cent.) will dissolve. no These may not be without interest and 



Gm. benzoyl eugenol. value, and it seems probable that an 



C3H5 C3H5 analyst, who is able to use the microscope, 



+ KOH=^l I +H2O may by a few moments' careful examina- 



''0CH,5 L J0CH3 tion obtain evidences that will materially 



OH OK aid him in subsequent chemical analysis. 



Eugenol. Potassium Eugenol Regarding the statements made by some 



C3H5 C3H5 tjjat "the results 01 microscopical exami- 



^Cl— C— C6H5=| I -l-KCl. nation are not always uniform," I must 



-'OCH3 II I I0CH3 j-gfei- them to the non-conformity in re- 



OK O— C— CgHs suits of analytical chemists in organic 



II and even inorganic analyses, unless by 



Potassium Eugenol. Benzoyl Eugenol. practice the individual masters the diffi- 



Thoms has worked out an algebraic for- culties. And again it has been recently 



mula for hastily calculating the results, said, "that in the case of the deterioration 



which may be translated as follows : of vegetable drugs through atmospheric 



a=weight of benzoyl eugenol. influences or age, as well as in the adul- 



b=weight of oil taken. teration of a genuine with inferior drugs, 



c=+o.iio Gm. for every 5 Cc. of alcohol ^^e difficulty of determining with the mi- 

 used (bemg the weight of benzoyl euge- ^ ^ 

 nol dissolved in 90 per cent, alcohol). croscope the respective extent of change or 

 x=per cent, of eugenol. adulteration is almost insuperable. " This 

 Molecular weight of eugenol;^ 1 64. j -i u • 1 

 Molecular weight of benzoyl eugenol=268. may seem to be so, and while chemical 



'^^^'^io ^ / 1 ^ ■ x,^ c 1 analysis is necessarv, still there are many 



268 : i64=(a+c): weight of eugenol. "■ 1 -■> 



, , , , cases where the quantitative determination 



io4(a4-c) ^ • T t- 



Weight of eugenol= . of admixtures and adulterations, if they 



, , , , ^^^ are to be determined, can be done so only 



164 (a+c) r^. ■ 



b: =100 :x. by means of the microscope. 



2^^ It would not be a hard matter to prepare 



^^ i64(a+c).ioo ^ lengthy paper on the difficulties attend- 



268b 



4lOo(a+c) * This sample was determined by the microscope to 



X= contain powdered clove stems, although sold by a large 



67b house in New York as powdered cloves. 



