24 



however, predominates. Its taste is not so disagreeable as the 

 preceding, and more cooling and mint-like. It has a specific 

 gravity of 0.917 ; it boils at 300, the mercury subsequently 

 rising to 350. Reduced to a temperature of F., it remained 

 perfectly clear : it ignites with difficulty in open vessels. In a 

 lamp it gives a dense white flame, superior to kerosene, without 

 smoke or smell. It is a good solvent for a variety of resinous 

 bodies. 



The following results were obtained by M. Cloez in his chemi- 

 cal investigations in E. globulus : 



From leaves which had been brought from Australia, and were 

 completely dry, he obtained about 1.5 per cent, essential oil [in 

 Table VII. 0.72 is given as the percentage obtained from fresh 

 leaves, assuming the latter to contain 53 per cent, water (vide 

 note to Table) : calculation will give 1.53 as the percentage to 

 be obtained from the dry material ; coinciding with the results 

 obtained by M. Cloez.] 



M. Cloez says : This essence is a very fluid liquid, slightly 

 coloured, and having an aromatic odor, which reminds one of 

 camphor. Heated in a distilling apparatus, it commences to 

 boil at about 338 F. The thermometer rises rapidly to 347 F., 

 where it remains till about half the product has passed in distil- 

 lation. Another portion of the essential oil passes between 

 370.4 and 374 F. By further application of heat, a small 

 quantity of volatile liquid is obtained at a temperature slightly 

 over 392 F. 



The liquid distilled between 338 and 352.4 F. is not a pure 

 product. On rectifying with potash and chloride of calcium, a 

 very fluid colorless liquid is obtained, which boils at 347 F., 

 and which M. Cloez calls Eucalyptol. It is much lighter than 

 water; its density is 0.905 at 46. 4 F., and it turns the plane 

 of polarisation to the right. It is soluble in alcohol, but only 

 very slightly so in water. Its composition, according to M. 

 Cloez, is (724 -^20 0%- When treated with nitric acid, one of 

 the products of the reaction is a crystallisable acid, probably 

 analagous to camphoric acid. Another product, obtained by 

 distillation of Eucalyptol with phosphoric anhydride in a retort, 

 is Eucalyptene, a hydrocarbon with the formula GI H\%. A 

 further product, obtained by the action of phosphoric anhydride, 

 is called by M. Cloez Eucalyptolene. 



