— 26 — 



into a laevorotatory, and the latter into the same dextrorotatory hydro- 

 carbon. In their other physical and chemical properties the two are 

 identic. This is also proved by the fact that the mixture of cypress 

 camphor and cedar camphor shows no depression of the melting point, 

 but melts uniformly at 86° to 87° 



The distillation residue of cypress oil forms a viscid brown resin 

 with a ladanum-like odour. We have also occupied ourselves with the 

 examination of this product which is valuable for the odour of the oil, 

 but up to the present we have not arrived at any particular result. 



We may here mention that the assumed terpene alcohol 1 ) contained 

 in the fractions boiling at 90°to95° (4 mm. pressure), contrary to our 

 previous observation 2 ), does form a phenyl urethane of the melting 

 point 142 to 1 44 . 



As the result of our examination we have detected in cypress oil: 

 furfurol, d-pinene, d-camphene, d-sylvestrene, cymene, a ketone, sabinol (?), 

 a terpene alcohol (?), d-terpineol of the melting point 35 as ester 

 (probably as acetate), valerianic acid, 1-cadinene, a sesquiterpene alcohol, 

 cypress camphor (identic with the sesquiterpene alcohol of cedar oil), 

 and a body with a ladanum-like odour. Of these, d-pinene and also 

 cypress camphor had already previously been detected by us in the oil. 



Elemi Oil, Tacamahaca. During their further researches on 

 secretions, A. Tschirch and O. Saal 3 ) isolated by steam distillation 

 from Tacamahaca elemi, an essential oil in a yield of 2 °/ . It had 

 a bright yellow colour and a peculiar aromatic odour reminding more 

 of borneol than of the oils obtained from elemi. On fractional distil- 

 lation of the oil, a colourless oil with a pleasant odour passed over 

 at 70 , whilst the bulk distilled over at 170 to 175 in the form of 

 a bright-yellow oil with a faint empyreumatic odour which became more 

 pronounced in the following fractions (190 to 195 and 220 ). Above 

 220 there passed over a dark-yellow to brown oil possessing an un- 

 pleasant pungent odour. A thick, dark- brown mass with a strong tar- 

 like odour remained behind as residue. 



The same authors 4 ) obtained in the same manner from genuine 

 commercial Tacamahaca elemi about 3 °/ of a yellow essential oil whose 

 odour reminded very distantly of that of the typical elemi resins, but 

 more of camphor and turpentine. The bulk of the oil distilled over 

 between 170 and 175 as a colourless oil, whilst between 1 75 and 

 210 the remaining oil passed over as a dark-coloured portion which 

 possessed a somewhat empyreumatic odour. 



*) Report April 1904, 40. 



2 ) loc. cit. 



3 ) Arch, der Pharm. 242 (1904), 362. 



4 ) Arch, der Pharm. 242 (1904), 400. 



