114 



Report of Schimmel § Co. 1922. 



of a neutral solvent, e. g., turpentine oil, with addition of sodium acetate. Basing on this 

 reaction 0. Fernandez and N. Luengo 1 ) worked out a method for the estimation of terpin. 



Although the inaccuracy of the phosphoric acid process for the determination of 

 cineole is long known — even C. E. Sage and J. D. Kettle 2 ) admit readily that the method 

 is not so exact as a purely chemical method — we very frequently meet with endeavours 

 to puff up that process whenever an opportunity arises. Such an opportunity arose 

 recently with the publication of Tusting Cocking's cresineol method 3 ) and Kleber's and 

 von Rechenberg's 4 ) solidification point test. Sage and Kettle point out that the former 

 author 5 ), when comparing the "phosphoric" and "resorcinol" methods, found considerable 

 discrepancy between the results of both methods (which fact we take as proof for the 

 inaccuracy of the "phosphoric" method), and now they publish the results of compar- 

 ative cineole determinations in a few eucalyptus oils and cineole samples, carried out 

 according to the "phosphoric", cresineol, and solidification point methods. The results 

 which differ to the utmost by 6 per cent and are hardly worth any discussion, are, in 

 our opinion, not in favour of the phosphoric acid process, as the authors maintain. 



F. B. Power 6 ) recommends the following process for detecting methyl 

 anthranilate in fruit juices: — From 500 ccm. of the liquid 200 ccm. are 

 distilled off, and the distillate which in presence of an appreciable 

 quantity of the ester shows a bluish fluorescence, is shaken out three 

 times with each 10 ccm. of chloroform (not ether). The residue ob- 

 tained on careful evaporation of the chloroform extract is immediately 

 treated with 2 ccm. of 10 per cent, sulphuric acid, the acid liquor is 

 transferred to a test-tube and cooled. To the liquor one drop of a 5 

 per cent, solution of sodium nitrite is added, then a few crystals of 

 urea, and subsequently one of the following two reagents: — a. a mixture 

 of one ccm. of a 0.5 per cent, solution of pure ^-naphthol containing 

 0.2 per cent, of sodium hydroxide, one ccm. of a 10 per cent, solution 

 of sodium hydroxide, and one ccm. of a 10 per cent, solution of mono- 

 hydrated sodium carbonate, Na 2 C0 3 • H 2 0. If not less than 0.0001 gr. 

 of methyl anthranilate is present, a yellowish-red precipitate will be 

 produced; b. one drop of dimethylaniline, and, when the latter has 

 completely dissolved, a slight excess of a 10 per cent, solution of sodium 

 hydroxide. The yellowish coloration produced in presence of not less 

 than 0.001 gr. of the ester changes to red on slightly acidifying the 

 mixture with dilute sulphuric acid. 



By this process the author believes to have overcome the errors such 

 as possible with the Erdmann method 7 ) (incomplete separation of the ester 

 which is not free from foreign admixtures). The results of the investigation 

 of grape juices by this process are reserved for a future communication. 



The estimation of phenylacetaldehyde in the cassia flask according to 

 the bisulphite method is often connected with difficulties and is frequently 

 inexact, since the heavy non-aldehydic (polymerized) constituents of the aldehyde remain 

 at the bottom of the flask. A. Reclaire 8 ) recommends to modify the process as follows: — 



!) Ann. soc. espanola Fis. Quim. [2] 18 (1920), 158. As per Chem. Zentralbl. 1921, IV. 687. — 2 ) Perfam. 

 Record 12 (1921), 44. — 3 ) Cf. Bericht (German) 1921, 65. — ±) Ibidem 35. — B ) Cf. Report October 1910, 

 67. — 6) Journ. Amer. chem. Soc. 43 (1921), 377. — ') Berl. Ber. 35 (1902), 24 and 2355. — 8 ) Perfum. 

 Record 12 (1921), 341. 



