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adulterants added with fraudulent intent. Special methods for detecting 

 both kinds of impurities are given, but these are not mentioned in the 

 abstract. According to the, generally speaking friendly, criticism of Blarez' 

 paper by Vezes 1 ) these methods appear to consist of the usual tests of 

 the sample (also, according to Vezes of the separate fractions) for sp. gr., 

 rotation, refraction index, acid value, miscibility with aniline, and be- 

 haviour towards cone, sulphuric acid and towards fuming nitric acid. 

 Vezes demands that for the purpose of fractionation 250 instead of 100 cc. 

 oil shall be used. 



Vezes 2 ), in a pamphlet published by the "Laboratoire de Chimie 

 appliquee a l'lndustrie de Resines", of Bordeaux, deals in great detail 

 with the collection of turpentine oil and colophony in the Landes. In 

 the course of this account he describes an apparatus, constructed by 

 Castet 3 ) for continous distillation at a temperature not exceeding 140°. 

 The method of cooling is exceedingly practical and original. The steam, 

 having first been cooled under reduced pressure, is conducted into a 

 second cooling-apparatus in which there is an over-pressure of 2 atm. 

 which thoroughly condenses all the volatile constituents. Finally the 

 author refers to a method of preparing turpentine oil recommended by 

 Schkateloff 4 ), based upon the filtration of the balsam at 100° and sub- 

 sequent cooling. In this process the sylvinic acid is separated in crystal- 

 form. It is then pressed out, and the pressed residue is worked up for 

 turpentine oil. The sylvinic acid which has been pressed out, when mixed 

 with a little turpentine oil, makes an excellent colophony. 



R. Massy 5 ) has devised a method for the detection of petroleum in 

 French turpentine oil which is based upon the changes which the specific 

 gravity undergoes upon the addition of adulterants. The method is as 

 follows: Of 25 cc. turpentine oil, distil off 20 cc, of which quantity intro- 

 duce 0,5 cc. in 5 cc. of 80,7 °/o alcohol. If the drop of oil remains floating 

 on the surface the oil is adulterated with petroleum. As the author ex- 

 pressly points out, the method is only applicable to the turpentine oil 

 produced in the Landes. 



Several districts of Algeria have again been thrown open for the 

 preparation of turpentine oil from the turpentine of Pinns halepensis 6 ). For 



*) Ann. falsific. 3 (1910), 265. Quoted from Chem. Ztg. Repert. 34 (1910), 479. 



2 ) La recolte et le traitement de la Gemme du Pin maritime, Bordeaux 1910. From a 

 copy kindly sent to us. 



3 ) French patent No. 391835 of June 30 th 1908. 



4 ) Moniteur scientifique 22 (1908), 217. 



5 ) Sur Une nouvelle methode densimetrique et son application a l'essence de terebenthine 

 des Landes. Travaux du Laboratoire de Chimie appliquee a l'lndustrie des Resines. Bordeaux 

 1910. From a copy kindly sent to us. 



6 ) Bull, de l'Office du Gouvern. de 1'Algerie 16 (1910), 292. Comp. also Report April 1909, 89. 



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