- 87 - 



half should pass over between no and 130 ; of the balance part 

 should pass over between 130 and 1 50 , and the remainder above 200 2 ). 



*) The limits should be made wider: 0,890 to 0,930. 



2 ) The statements on the behaviour of mace oil on boiling are quite wrong. 

 The oil boils chiefly (about 75°/ ) between 165 and 200 , the balance between 

 200 and 280 . Th. Hoogenboom has also recently called attention to this, and 

 his statements agree on the whole with ours. Comp. Pharm. Weekblad 43 (1906), 743. 



Menthol (Mentholum). Colourless, hexagonal prisms; soluble in 

 0,2 parts spiritus, readily in chloroform and ether; m. p. 43 ; b. p. 21 6°; 

 when triturated with camphor, thymol or chloral hydrate it liquefies; 

 if a solution of 1 g. menthol in 5 cc. spiritus is mixed with 5 cc. water, 

 the mixture must have a neutral reaction; menthol must be completely 

 volatile at the temperature of the water bath. 



Methyl Ester of Salicylic Acid (Salicylas methylicus). Colourless, 

 completely volatile; neutral reaction; di 5 o 1,176 l ); b. p. 223 to 224 ; 

 soluble in every proportion in spiritus; identity reactions. 



x ) The spec, gravity indicated is wrong; it should be 1,185 to l i l 9°> 



Mustard Oil (Oleum sinapis). Colourless or yellowish; d^o 1,01s 1 ) 

 to 1,025; soluble in every proportion in spiritus; sulphuric acid test; 

 thiosinamine test. 



x ) We have observed in our own distillates down to 1,014. 



Orange Oil, bitter [Oleum aurantiorum). Yellowish; d^o 0,850 

 to 0,870*); on distillation the oil should almost completely pass over 

 between 175 and 180 ; soluble in 7 vol. spiritus 2 ). 



1 ) The upper limit of value is given too high; we have never observed in 

 pure oils above 0,860. 



2 ) The solutions are not always clear, owing to the presence of wax-like con- 

 stituents. 



Peppermint Oil [Oleum menthae piperitae). Colourless or yellow- 

 ish; d^o 0,900 to 0,920 L ); soluble in every porportion in spiritus 

 and in 5 vol. spiritus dilutus, in the last-named case possibly with 

 faint opalescence; content of total menthol at least 5i,68°/ ; colour 

 reaction with glacial acetic and nitric acids. 



*) According to the specific gravity both English and American oils are 

 admitted. 



Rose Oil (Oleum rosarum). At 20 yellowish to greenish liquid; 

 ^30° 0,850 to 0,860 l ); when cooled solidification takes finally place 

 with separation of small crystals; when diluted with 10 times the 

 vol. spiritus, rose oil gives a mixture clouded by flaky separations, 

 when heated to a little above 30 , the flakes are partly dissolved, 

 and partly float as oil drops on the surface of the liquid. 



*) The limits of value at 30 are 0,849 and 0,862. 



Rosemary Oil (Oleum rosmarini). Colourless or greenish yellow; 

 di 5 o 0,900 to 0,920; «d not above -j- 15 01 ); a o of the first io°/ 

 of the distillate also to the right; soluble in 0,5 vol. spiritus; on 



