412 ODOllOGEAPHIA. 



Reaction ivith Brominated chloroform .To 2 drops of the oil 

 contained in a dry test-tube, a solution of bromine in chloroform 

 (about 5 per cent.) is gradually added, until a faint yellow colora- 

 tion is produced ; the mixture is then set aside for several hours. 

 No distinct coloration is produced at once, but after standing some 

 hours, each sample assumed a more or less greenish-blue hue. 

 This was most marked in No. 3 and least in No. 2. No. 1 rather 

 more deeply tinted than No. 4. 



Reaction with ferric chloride. Four drops of the oil are added 

 to 4 drops of solution of feriic chloride (Fr. Codex : 26 per cent. 

 Fcg Clg free from nitric acid) and 10 drops of sulphuric acid (sp. 

 gr. 1'843) added. After 30 seconds 5 c. c. of carbon disulphide are 

 added, agitated, and the disulphide poured off into a white dish« 

 In each case the liquid was deeply coloured of a purplish-rose tint, 

 which changed to dull-violet after several hours. 



Reaction with fowdered iodine. Applied in the usual way, 

 scarcely any action took place with any of the samples. 



Phellandrene test* This was applied only to Nos. 1 and 4, 

 which gave negative results. 



Action of Bromine. If Bromine be added drop by drop to 

 Cineol, it is at first decolorised, but afterwards a red crystalline 

 compound is produced. This, when kept in closed vessels, 

 gradually runs to a liquid and finally deposits white crystals which 

 melt at 125*^-5 C. These consist of cinene tetrabromide. 

 Wallachf states that cineol is present in oil of rosemary amongst 

 other oils, which statement I can confirm, as I obtained abundance 

 of cinene tetrabromide by treating English oil (No. 1) in the 

 manner described. 



Iodine absorption. 1 am of opinion that except in a few special 

 cases, this test is of no value for essential oils, although very 

 valuable for fixed oils and fats. In the case of rosemary, I have 

 applied it only to sample No. 1, with which it did not give 

 concordant results ; consequently, I did not follow it up with the 

 other samples. I append my results with those already published 

 by others : — 



* For the detection of Phellandrene, see p. 187 in article " Elemi." 

 + Wallach, in Pharra. Journ. [3], xviii. p. 481. 



