— 73 — 



A ) The Pharmacopoeia here quite correctly only requires approximate values, as 

 oil of chenopodium is extremely variable owing to its content of a constituent which 

 decomposes very readily; this also causes changes in the specific gravity. 



2 ) We have observed with good commercial oils, rotations up to — 6°. 



Cinnamic aldehyde {Cinnaldehydum). Colourless 1 ); containing 

 at least 95% pure cinnamic aldehyde; d25o about 1,047 2 ); a r>io°; 

 boils about 250 with decomposition; solidifies in a freezing mixture 

 and melts again at — 7,5°; soluble in every proportion in alcohol. 



1 ) Cinnamic aldehyde is not colourless, but bright yellow. 



2 ) The statement of the specific gravity is not correct, it should read: d 25 o 1,048 

 to 1,052 (comp. table). 



Clove Oil {Oleum caryophylli). Colourless or pale yellow; eugenol- 

 content at least 80 per cent, by volume; d25Q 1,040 to 1,060 2 ); sol- 

 uble in an equal volume alcohol, and in about 2 volumes 70 per 

 cent, alcohol. 



x ) As oils with a eugenol-content down to 8o°/ are admitted, the lower limit 

 of the specific gravity should be reduced to 1,033 (comp. table). 



Copaiba Oil {Oleum copaiba). Colourless or pale yellow, d25© 0,895 

 to 0,905 x ); «d to the left; soluble in 2 vol. alcohol 2 ). 



*) The specific gravity at 15 amounts to up to 0,918, as we have recently 

 observed with one of our own distillates (comp. Report April 1905, 25). The 

 specific gravity mentioned corresponds to the value 0,915 at 25 (see table). 



2 ) On the strength of observations with authentic material we are in a 

 position to state that 1 vol. copaiba oil requires 5 to 10 vol. 95 per cent, alcohol 

 to form a solution. See Report April 1905, 25. 



Coriander Oil (Oleum coriandri). Colourless or faintly yellow; 

 d 2 50 0,863 to 0,878; «D25° -f- 7 to H - x 4°; soluble in 3 volumes 

 70 per cent, alcohol; in 80 and 90 per cent, alcohol soluble in every 

 proportion. 



Oil of Cubebs {Oleum cubebce). Colourless, pale green, or yellow; 



<W 0,905 to 0,925; «D25o — 25 tO — 40 °. 



Erigeron Oil {Oleum erigerontis). Faintly yellow; d 2 5o 0,845 to 

 0,865; a D25° about-]- 50 ; soluble in an equal volume alcohol. 



Eucalyptol. Colourless; d 2 5o 0.925 x ); «d ±o°; boiling point 

 176 to 1 77 °; solidifies on cooling into needle-shaped crystals, which 

 melt at — 1 ° ; soluble in every proportion in alcohol. 



*) The specific gravity at 25 is not 0,925, but fluctuates between 0,921 and 

 0,923 (comp. table). 



2 ) Solidification has to be started in case of need by rubbing a glass rod on 

 the wall of the vessel. 



Eucalyptus Oil {Oleum eucalypti). Colourless or faintly yellow 1 ); 

 cineol-content at least 50 per cent, by volume 2 ); d25o 0,905 to 0,925; 

 a D 2 5 not above -J- io°; soluble in every proportion in alcohol and 

 in 3 volumes 70 per cent, alcohol; free from phellandrene. 



*) The oil has occasionally also a greenish shade. 



2 ) With regard to the cineol - estimation , compare what has been said under 

 cajeput oil. 



