— 9o — 



Cassia Oil {Essentia cinnamomi). Yellow or brownish; (I150 

 I >°55 to i>o7°; aldehyde-content at least 7O°/ l ); residue on evap- 

 oration not above 8°/ 2 ); soluble in 1 to 2 parts 80 per cent. 

 alcohol 3 ); nitric acid test; ferric chloride reation. 



In addition to cassia oil, pure cinnamic aldehyde and Ceylon 

 cinnamon oil are also admitted. 4 ) 



1 ) The aldehyde-content of good cassia oils is at least 75°/o* 



2 ) In view of the difficulty of volatilising cinnamic aldehyde, the cassia oils 

 will answer this requirement only in exceptional cases. We have in a pure oil 

 determined the following values: residue on evaporation after 5 hours, 54,6 °/ » 

 after 14 hours 28,9 °/ , after 24 hours 19,0° . For this reason the above-mentioned 

 requirement of the pharmacopoeia only applies to the distillation-residue, for 

 the determination of which see Gildemeister and Hoffmann, The Volatile 

 Oils, p. 382. 



3 ) The solution shows occasionally a faint opalescence. 



4 ) For cinnamic aldehyde and Ceylon cinnamon oil we give here the properties : 

 Cinnamic aldehyde. Bright yellow: di.50 1,054 to 1,058; ajj + o°; b. p. 



about 2 5 2°, with partial decomposition; solidifies when much reduced in temperature, 

 and melts again at — 7,5°; soluble in about 2 vol. 70 per cent, alcohol; must be 

 free from compounds containing chlorine. 



Ceylon cinnamon oil. Bright yellow; di.50 1,023 to 1,040; ajy slightly to 

 the left, to — i°; aldehyde- con tent between 65 and 7 6°; soluble in 2 to 3 and 

 more vol. 70 per cent, alcohol. 



Chamomile Oil, Roman (Essentia chamomillae). Blue, subse- 

 quently green, finally yellow-brown; di 5 o 0,905 to 0,915; sap. no. 

 250 to 300; soluble in 2 vol. 80 per cent, alcohol. 



Eucalyptol (Eucalyptolum, essentia eucalypti) 1 ). Colourless; d^o 

 0,928 to 0,930; «d±o°; b. p. 176 to 1 77 ; almost insoluble in water, 

 readily soluble in alcohol, ether, chloroform and fatty oils; makes a 

 clear solution with an equal vol. Paraffinum liquidum\ in a freezing 

 mixture eucalyptol must solidify at — 1° into long colourless needles 2 ); 

 volatile on the water bath without residue; identity reaction with 

 bromine. 



*) Comp. note under anethol. 



2 ) Solidification must if necessary be started by rubbing a glass rod on the 

 side of the vessel. 



Eugenol (Eugenolum, essence de girofle) 1 ). Colourless or yellowish, 

 becoming brown on exposure to the air; d^o 1,072 2 ) to 1,074; 

 b. p. 251 to 253; sparingly soluble in water, completely in alcohol, ether, 

 and glacial acetic acid; identity reactions and test for phenol. 



*) Comp. note under anethol. 



2 ) Comp. note p. 86 in the discussion of the Dutch Pharmacopoeia under 

 eugenol. 



Fennel Oil (Essentia foeniculi). Colourless or yellowish; d^o 0,965 

 to 0,9 7 5 x ); soluble in an equal vol. alcohol; at o° crystals of anethol 

 separate off, which dissolve again at -J- 5 2 ). 



