— 4 i — 



m. p. 146 to 147 . The other more readily soluble derivative may 

 possibly melt below ioo°, and be identical with geranyl naphthyl urethane. 



Terpinyl naphthyl urethane from terpineol of the m. p. 35 . 

 The reaction-mixture does not become solid even after standing for 

 6 days. The oily product is treated with water vapour, and the solid 

 distillation-residue boiled out with petroleum ether. From dilute alcohol 

 the urethane crystallises in feathery prisms of the m. p. 147 to 148 . 

 The derivative of terpineol of the m. p. 32 is also purified from 

 alcohol. Hard, glassy prisms of the m. p. 83 to 84 . 



Linalyl naphthyl urethane. For the production of this derivative 

 it is necessary to heat for several hours the mixture of linalool and 

 naphthyl isocyanate, after it has been standing for 5 to 6 days; but 

 even then only very little has been formed. The urethane crystallises 

 from dilute methyl alcohol in rosette - shaped needles of the m. p. 53 . 



From nerol and citronellol, only oily naphthyl urethanes were 

 obtained which did not crystallise even when cooled and when left 

 standing for weeks. 



Heracleum Oil. It is now well known that this oil is obtained 

 from the fruit or the entire umbellate heads of Heracleum sphondylium L. 

 A distillate which we have obtained from the dry umbels from 

 which the fruit had been removed, is for this reason interesting. 

 The yield of oil amounted to 0,08 °/ . The odour of the brownish 

 yellow oil differs distinctly from that of the fruit. di5o 0,9273; 

 « D — o°48 ; ; acid no. 16,2; ester no. 148,6; ester no. after acetyl- 

 ation 195,9; soluble in 1,1 vol. 80 per cent, alcohol; when more solvent 

 is added opalescence and strong separation of paraffin occur, For 

 comparison we give below the properties of two oils distilled from 

 the fruit only. 



1. Yield (compared with dry material) 0,9 °/ ; di 5 o 0,8744; 

 a D -j-°°38'; ac id no - 15,9; ester no. 215,4; ester no. after acetyl- 

 ation 285,3; soluble in 0,8 and more vol. 80 per cent, alcohol; not 

 entirely soluble in 70 per cent, alcohol. 



2. Yield (compared with dry material) i,2i°/ ; dt 5 o 0,8798, 

 "d -j-i°6 / ; acid no. 7,3; ester no. 242,4; ester no. after acetylation 

 276,3; soluble in 1 and more vol. 80 per cent, alcohol. 



A distillate from the dry, ripe fruit of Heracleum giganteum L. 

 (yield 3,6°/ ) behaved as follows: di 5 o 0,8722; « D -f- i° 14'; acid no. 

 1,6; ester no. 288,3; ester no - a f ter acetylation 314,2; soluble in 

 1 and more vol. 80 per cent, alcohol. The colourless oil had a 

 peculiar odour, similar to that of common heracleum oil. 



Hop Oil. We are informed that the development of the hop 

 plants has been retarded by unfavourable weather, and that in many 

 districts the gardens have suffered much from the spread of pests. 



